Every man takes the limits of his own field of vision for the limits of the world.

If there is a kind of "proof" of the sincerity of the parrhesiastes, it is his courage... Saying something dangerous-different from what the majority believes-is a strong indication that he is a parrhesiastes.

It appears... that a work similar in its object and general conception to that of Adam Smith, but adapted to the more extended knowledge and improved ideas of the present age, is the kind of contribution which Political Economy at present requires. The Wealth of Nations is in many parts obsolete, and in all, imperfect. Political Economy... has grown up almost from infancy since the time of Adam Smith; and the philosophy of society... has advanced many steps beyond the point at which he left it.

I do not carry such information in my mind since it is readily available in books. ...The value of a college education is not the learning of many facts but the training of the mind to think.

Let a man take time enough for the most trivial deed, though it be but the paring of his nails. The buds swell imperceptibly, without hurry or confusion; as if the short spring days were an eternity.

It is our deliberate opinion that the French Revolution, in spite of all its crimes and follies, was a great blessing to mankind.

There is only one way to science-or to philosophy... to meet a problem, to see its beauty and fall in love with it; to get married to it, and to live with it happily, till death do ye part-unless you should meet another... more fascinating problem, or... obtain a solution. But even if you do... you may... discover, to your delight, the... a whole family of enchanting... perhaps difficult problem children for whose welfare you may work, with a purpose, to the end of your days.

Physiology does not teach us how to digest, nor logic how to discourse, nor esthetics how to feel beauty or express it, nor ethics how to be good. And indeed it is well if they do not teach us how to be hypocrites; for pedantry, whether it be pedantry of logic, or of esthetics, or of ethics, is at bottom nothing but hypocrisy.

An evil may be real, tho' its cause has no relation to us: It may be real, without being peculiar: It may be real, without shewing itself to others: It may be real, without being constant: And it may be real, without falling under the general rules. Such evils as these will not fail to render us miserable, tho' they have little tendency to diminish pride: And perhaps the most real and the most solid evils of life will be found of this nature.

The governors of the world believe, and have always believed, that virtue can only be taught by teaching falsehood, and that any man who knew the truth would be wicked. I disbelieve this, absolutely and entirely. I believe that love of truth is the basis of all real virtue, and that virtues based upon lies can only do harm.

Government must be a transparent garment which tightly clings to the people's body.

As an empiricist I continue to think of the conceptual scheme of science as a tool, ultimately, for predicting future experience in the light of past experience. Physical objects are conceptually imported into the situation as convenient intermediaries-not by definition in terms of experience, but simply as irreducible posits comparable, epistemologically, to the gods of Homer. For my part I do, qua lay physicist, believe in physical objects and not in Homer's gods; and I consider it a scientific error to believe otherwise. But in point of epistemological footing the physical objects and the gods differ only in degree and not in kind. Both sorts of entities enter our conception only as cultural posits. The myth of physical objects is epistemologically superior to most in that it has proved more efficacious than other myths as a device for working a manageable structure into the flux of experience.

To be content with life - or to live merrily, rather - all that is required is that we bestow on all things only a fleeting, superficial glance; the more thoughtful we become the more earnest we grow.

I believe government, organized authority, or the State is necessary only to maintain or protect property and monopoly. It has proven efficient in that function only. As a promoter of individual liberty, human well-being and social harmony, which alone constitute real order, government stands condemned by all the great men of the world...I believe - indeed, I know - that whatever is fine and beautiful in the human expresses and asserts itself in spite of government, and not because of it.

Ask the world to reveal its quietude - not the silence of machines when they are still, but the true quiet by which birdsongs, trees, bellworts, snails, clouds, storms become what they are, and are nothing else.

The problem of induction is, roughly speaking, the problem of finding a way to prove that certain empirical generalizations which are derived from past experience will hold good also in the future. There are only two ways of approaching this problem on the assumption that it is a genuine problem, and it is easy to see that neither of them can lead to its solution.

Genes and culture have co-evolved. But crudely, natural selection "designed" male human primates to hunt nonhumans and build coalitions of other male human primates in order to wage territorial wars of aggression. Nature didn't design us to become a scientific community and collaborate to overcome aging. It's difficult to imagine that any human enemy could inflict such gruesome damage on the victims as growing old. The ravages of aging strike down combatants and civilians alike. So the trillions of dollars that humans currently spend on ways to harm and kill each other ("defence") would be more fruitfully spent on defeating our common enemy. We should work together to build a "Triple S" civilisation of superlongevity, superhappiness and superintelligence.

I don't know why we are here, but I'm pretty sure that it is not in order to enjoy ourselves.

As it has long been and shall be, not ever, I think, will unfathomable time be emptied of either. This quote refers to Love and Strife, the fundamental opposing and ordering forces in Empedocles' model of the cosmos.

Truly, if the preservation of all mankind, as much as in him lies, were every one's persuasion, as indeed it is every one's duty, and the true principle to regulate our religion, politicks and morality by, the world would be much quieter, and better natur'd than it is.

The principles of justice are chosen behind a veil of ignorance.

The circulation of commodities is the original precondition of the circulation of money.

If God did not exist, it would be necessary to invent him.

As a rule there are in everyone all sorts of good ideas, ready like tinder. But much of this tinder catches fire, or catches it successfully, only when it meets some flame or spark from outside, i.e. from some other person. Often, too, our own light goes out, and is rekindled by some experience we go through with a fellow-man. Thus we have each of us cause to think with deep gratitude of those who have lighted the flames within us.

Life has always seemed to me like a plant that lives on its rhizome. Its true life is invisible, hidden in the rhizome. The part that appears above ground lasts only a single summer. What we see is the blossom, which passes. The rhizome remains. Closing lines of the preface

The power of thought is the light of knowledge, the power of will is the energy of character, the power of heart is love. Reason, love and power of will are perfections of man.

The natural impulse of the primitive man to strike back, to avenge a wrong, is out of date. Instead, the civilized man, stripped of courage and daring, has delegated to an organized machinery the duty of avenging his wrongs, in the foolish belief that the State is justified in doing what he no longer has the manhood or consistency to do.

Respectable scientists like de Broglie himself accept wave mechanics because it confers coherence and unity upon the experimental findings of contemporary science, and in spite of the astonishing changes it implies in connection with ideas of causality, time, and space, but it is because of these changes that it wins favor with the public. The great popular success of Einstein was the same thing. The public drinks in and swallows eagerly everything that tends to dispossess the intelligence in favor of some technique; it can hardly wait to abdicate from intelligence and reason and from everything that makes man responsible for his destiny.

The moment we believe we've understood everything grants us the look of a murderer.

If a single cell, under appropriate conditions, becomes a man in the space of a few years, there can surely be no difficulty in understanding how, under appropriate conditions, a cell may, in the course of untold millions of years, give origin to the human race.

the ultimate end, with reference to and for the sake of which all other things are desirable...is an existence exempt as far as possible from pain, and as rich as possible in enjoyments...This, being, according to the utilitarian opinion, the end of human action, is necessarily also the standard of morality; which may accordingly be defined, the rules and precepts for human conduct, by the observance of which an existence such as has been described might be, to the greatest extent possible, secured to all mankind; and not to them only, but, so far as the nature of things admits, to the whole sentient creation.

The Chinese do not draw any distinction between food and medicine.

Every man is a new method.

I shall doubtless outlive some troublesome desires; but I am in no hurry about that; nor, when the time comes, shall I plume myself on the immunity just in the same way, I do not greatly pride myself on having outlived my belief in the fairy tales of Socialism. Old people have faults of their own; they tend to become cowardly, niggardly, and suspicious. Whether from the growth of experience or the decline of animal heat, I see that age leads to these and certain other faults; and it follows, of course, that while in one sense I hope I am journeying towards the truth, in another I am indubitably posting towards these forms and sources of error.

The unfortunate thing about public misfortunes is that everyone regards himself as qualified to talk about them.

Philosophers who have wanted to banish the ghost from the machine have usually sought to do so by showing that truths about behavior can sometimes, and in some sense, logically implicate truths about mental states. In so doing, they have rather strongly suggested that the exorcism can be carried through only if such a logical connection can be made out. ... Once it has been made clear that the choice between dualism and behaviorism is not exhaustive, a major motivation for the defense of behaviorism is removed: we are not required to be behaviorists simply in order to avoid being dualists.

Every moment celebrates obsequies over the virtues of its predecessor.

All is riddle, and the key to a riddle is another riddle.

At one level, this movement on behalf of oppressed farm animals is emotional...Yet the movement is also the product of a deep intellectual ferment pioneered by the Princeton scholar Peter Singer...This idea popularized by Professor Singer - that we have ethical obligations that transcend our species - is one whose time appears to have come...What we're seeing now is an interesting moral moment: a grass-roots effort by members of one species to promote the welfare of others...animal rights are now firmly on the mainstream ethical agenda.

I am ashamed of belonging to the species Homo Sapiens...You & I may be thankful to have lived in happier times - you more than I, because you have no children.

Here then is what we understand by these words: "the equalization of the classes." It would perhaps have been better to say suppression of the classes, the unification of society by the abolition of economic and social inequality. But we have also demanded the equalization of the individuals, and it is there especially that we attract all the thunderbolts of outraged eloquence from our adversaries. One has made use of that part of our proposition to prove in a conclusive manner that we are nothing but communists.

I seem to be a brief light that flashes but once in all the aeons of time - a rare, complicated, and all-too-delicate organism on the fringe of biological evolution, where the wave of life bursts into individual, sparkling, and multicolored drops that gleam for a moment... only to vanish forever.

I do not open up the truth to one who is not eager to get knowledge, nor help out any one who is not anxious to explain himself. When I have presented one corner of a subject to any one, and he cannot from it learn the other three, I do not repeat my lesson.

Language is a form of organized stutter.

It is a question whether, when we break a murderer on the wheel, we do not fall into the error a child makes when it hits the chair it has bumped into.

All the good are friends of one another.