Saying is one thing, doing another.

Consider the Koran... this wretched book was sufficient to start a world-religion, to satisfy the metaphysical need of countless millions for twelve hundred years, to become the basis of their morality and of a remarkable contempt for death, and also to inspire them to bloody wars and the most extensive conquests. In this book we find the saddest and poorest form of theism. Much may be lost in translation, but I have not been able to discover in it one single idea of value.

Let what will be said or done, preserve your sang-froid immovably, and to every obstacle, oppose patience, perseverance, and soothing language.

One crime has to be concealed by another.

As for my own business, even that kind of surveying which I could do with most satisfaction my employers do not want. They would prefer that I should do my work coarsely and not too well, ay, not well enough. When I observe that there are different ways of surveying, my employer commonly asks which will give him the most land, not which is most correct.

In argument about moral problems, relativism is the first refuge of the scoundrel.

Among the smaller duties of life I hardly know any one more important than that of not praising where praise is not due.

So we are always esthetically disappointed when the sensuous qualities and the intellectual properties of an object do not coalesce.

Who holds a sword is tempted, who has youth must play,he who does not fear death on earth does not fear God.

When I happen to be satisfied with everything, even God and myself, I immediately react like the man who, on a brilliant day, torments himself because the sun is bound to explode in a few billion years.

As incompetent in life as in death, I loathe myself and in this loathing I dream of another life, another death. And for having sought to be a sage such as never was, I am only a madman among the mad.

The introduction of numbers as coordinates by reference to the particular division scheme of the open one dimensional continuum is an act of violence whose only practical vindication is the special calculatory manageability of the ordinary number continuum with its four basic operations. The topological skeleton determines the connectivity of the manifold in the large.

There is more to a science fiction story than the science it contains.

'Form' or 'figure' is space limited by boundaries. Space has necessarily 'three' dimensions, length, breadth, depth; and no ethers which cannot be resolved into these.

Valor is stability, not of legs and arms, but of courage and the soul.

The more man ascends through the past, and the more he launches into the future, the greater he will be, and all these philosophers and ministers and truth-telling men who have fallen victims to the stupidity of nations, the atrocities of priests, the fury of tyrants, what consolation was left for them in death? This: That prejudice would pass, and that posterity would pour out the vial of ignominy upon their enemies. O Posterity! Holy and sacred stay of the unhappy and the oppressed; thou who art just, thou who art incorruptible, thou who findest the good man, who unmaskest the hypocrite, who breakest down the tyrant, may thy sure faith, thy consoling faith never, never abandon me!

When we see a great man desiring power instead of his real goal we soon recognize that he is sick, or more precisely that his attitude to his work is sick. He overreaches himself, the work denies itself to him, the incarnation of the spirit no longer takes place, and to avoid the threat of senselessness he snatches after empty power. This sickness casts the genius on to the same level as those hysterical figures who, being by nature without power, slave for power, in order that they may enjoy the illusion that they are inwardly powerful, and who in this striving for power cannot let a pause intervene, since a pause would bring with it the possibility of self-reflection and self-reflection would bring collapse.

A belief in hell and the knowledge that every ambition is doomed to frustration at the hands of a skeleton have never prevented the majority of human beings from behaving as though death were no more than an unfounded rumour, and survival a thing beyond the bounds of possibility.

All natural philosophers, who wished to proceed mathematically in their work, have hence invariably (although unknown to themselves) made use of metaphysical principles, and must make use of such, it matters not how energetically they may otherwise repudiate any claim of metaphysics on their science.

The limits of this strategy were evident as the century drew to a close.

"'Are the gods not just?' 'Oh no, child. What would become of us if they were?'"

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.

Separate an individual from society, and give him an island or a continent to possess, and he cannot acquire personal property. He cannot be rich. So inseparably are the means connected with the end, in all cases, that where the former do not exist the latter cannot be obtained. All accumulation, therefore, of personal property, beyond what a man's own hands produce, is derived to him by living in society; and he owes on every principle of justice, of gratitude, and of civilization, a part of that accumulation back again to society from whence the whole came.

Morals excite passions, and produce or prevent actions. Reason of itself is utterly impotent in this particular. The rules of morality, therefore, are not conclusions of our reason.

Never stay up on the barren heights of cleverness, but come down into the green valleys of silliness.

The Guide sang: The new age, the new art, the new ethic and thought, And fools crying, Because it has begun It will continue as it has begun! The wheel runs fast, therefore the wheel will run Faster for ever. The old age is done, We have new lights and see without the sun. (Though they lay flat the mountains and dry up the sea, Wilt thou yet change, as though God were a god?)

No one should be judge in his own cause.

The domination of the public way in which things have been interpreted has already decided upon even the possibilities of being attuned, that is, about the basic way in which Da-sein lets itself be affected by the world. The they prescribes that attunement, it determines what and how one "sees."

It lies deep in our habits, confirmed by all manner of educational and other arrangements for several centuries back, to consider human talent as best of all evincing itself by the faculty of eloquent speech. Our earliest schoolmasters teach us, as the one gift of culture they have, the art of spelling and pronouncing, the rules of correct speech; rhetorics, logics follow, sublime mysteries of grammar, whereby we may not only speak but write. And onward to the last of our schoolmasters in the highest university, it is still intrinsically grammar, under various figures grammar. To speak in various languages, on various things, but on all of them to speak, and appropriately deliver ourselves by tongue or pen,-this is the sublime goal towards which all manner of beneficent preceptors and learned professors, from the lowest hornbook upwards, are continually urging and guiding us.

I am old, but I certainly have not that sign of old age, extolling the past at the expense of the present.

The Quaestor turned back the pages until he found himself among the Pensées. "We are not satisfied," he read, "with the life we have in ourselves and our own being; we want to live an imaginary life in other people's idea of us. Hence all our efforts are directed to seeming what we are not. We labor incessantly to preserve and embellish this imaginary being, and neglect that which is really ours." The Quaestor put down the book, ... and ruefully reflected that all his own troubles had arisen from this desire to seem what in fact he was not. To seem a man of action, when in fact he was a contemplative; to seem a politician, when nature had made him an introspective psychologist; to seem a wit, which God had intended him for a sage.

Without some affinity in human ideas art would certainly be impossible; but it can never be exactly determined how far the intentions of the poet are realized.

When an astronomer tells me that some stellar phenomenon, which his telescope reveals to him at this moment, happened... fifty years ago... I... ask... how he has measured the velocity of light.

Love is of all the passions the strongest, for it attacks simultaneously the head, the heart, and the body.

What we have is a device for producing sentences in response to sentences. But none of these sentences is at all connected to the real world. If one coupled two of these machines and let them play the Imitation Game with each other, then they would go on 'fooling' each other forever, even if the rest of the world disappeared! There is no more reason to regard the machine's talk of apples as referring to real world apples than there is to regard the ant's 'drawing' as referring to Winston Churchill.

Mercy to the guilty is cruelty to the innocent.

Examine the man who lives in misery because he does not shine above other men; who goes about producing himself, pruriently anxious about his gifts and claims; struggling to force everybody, as it were begging everybody for God's sake, to acknowledge him a great man, and set him over the heads of men! Such a creature is among the wretchedest sights seen under this sun. A great man? A poor morbid prurient empty man; fitter for the ward of a hospital, than for a throne among men. I advise you to keep out of his way. He cannot walk on quiet paths; unless you will look at him, wonder at him, write paragraphs about him, he cannot live. It is the emptiness of the man, not his greatness. Because there is nothing in himself, he hungers and thirsts that you would find something in him. In good truth, I believe no great man, not so much as a genuine man who had health and real substance in him of whatever magnitude, was ever much tormented in this way.

Over the years it has become my firm opinion that sexual activity (even if only through masturbation) is "requisite and necessary, as well for the body as for the soul"; for men and women alike. It stimulates your glands, exercises your pelvis, thrills your nerves, brings mind and body together as one, and culminates in an ecstasy in which there is neither past nor future nor separation between self and other. We need that as we need vitamins, proteins, water, and air.

No man expects such exact fidelity as a traitor.

If we do not return to the old maxims, if education is not restored into the hands of priests, and if science is not every where placed in the second rank, the evils which await us are incalculable: we shall become brutalized by science, and this is the lowest degree of brutality.

Those in the crossing must in the end know what is mistaken by all urging for intelligibility: that every thinking of being, all philosophy, can never be confirmed by "facts," ie, by beings. Making itself intelligible is suicide for philosophy. Those who idolize "facts" never notice that their idols only shine in a borrowed light. They are also meant not to notice this; for thereupon they would have to be at a loss and therefore useless. But idolizers and idols are used wherever gods are in flight and so announce their nearness.

Love to his soul gave eyes; he knew things are not as they seem. The dream is his real life; the world around him is the dream.

The highest proof of virtue is to possess boundless power without abusing it.

Gottlob Frege created modern logic including "for all," "there exists," and rules of proof. Leibniz and Boole had dealt only with what we now call "propositional logic" (that is, no "for all" or "there exists"). They also did not concern themselves with rules of proof, since their aim was to reach truth by pure calculation with symbols for the propositions. Frege took the opposite track: instead of trying to reduce logic to calculation, he tried to reduce mathematics to logic, including the concept of number.

He who knows only his own side of the case, knows little of that. His reasons may be good, and no one may have been able to refute them. But if he is equally unable to refute the reasons on the opposite side; if he does not so much as know what they are, he has no ground for preferring either opinion.

Hegel ... proceeds abstractly from the pre-existence of the intellect. ... He does not appeal to the intellect within us.