It depends on what we read, after all manner of Professors have done their best for us.

But the greatest thing by far is to have a command of metaphor. This alone cannot be imparted by another; it is the mark of genius, for to make good metaphors implies an eye for resemblances.

In fact, this infinitesimally spread-out consciousness is a direct feeling of its contents as spread out. In an infinitesimal interval we directly perceive the temporal sequence of its beginning, middle, and end... Now upon this interval follows another, whose beginning is the middle of the former, and whose middle is the end of the former. Here we have an immediate perception of the temporal sequence of its beginning, middle and end, or say, of the second, third, and fourth instants.

Compassion is the desire that moves the individual self to widen the scope of its self-concern to embrace the whole of the universal self.

Just as man as a social being, cannot in the long run exist without a tie to the community, so the individual will never find the real justification for his existence, and his own spiritual and moral autonomy, anywhere except in an extramundane principle capable of relativizing the overpowering influence of external factors.

After it hath been seen how the obstinate and the ignorant of evil disposition are accustomed to dispute, it will further be shewn how disputes are wont to conclude; although others are so wary that without losing their composure, but with a sneer, a smile, a certain discreet malice, that which they have not succeeded in proving by argument - nor indeed can it be understood by themselves - nevertheless by these tricks of courteous disdain they pretend to have proven, endeavouring not only to conceal their own patently obvious ignorance but to cast it on to the back of their adversary. For they dispute not in order to find or even to seek Truth, but for victory, and to appear the more learned and strenuous upholders of a contrary opinion. Such persons should be avoided by all who have not a good breastplate of patience.

If you want to be happy, be.

Not far from the invention of fire... we must rank the invention of doubt.

One can imagine a computer simulation of the action of peptides in the hypothalamus that is accurate down to the last synapse. But equally one can imagine a computer simulation of the oxidation of hydrocarbons in a car engine or the action of digestive processes in a stomach when it is digesting pizza. And the simulation is no more the real thing in the case of the brain than it is in the case of the car or the stomach. Barring miracles, you could not run your car by doing a computer simulation of the oxidation of gasoline, and you could not digest pizza by running the program that simulates such digestion. It seems obvious that a simulation of cognition will similarly not produce the effects of the neurobiology of cognition.

The seat of the soul is where the inner world and the outer world meet. Where they overlap, it is in every point of the overlap.

To resign oneself or to blow out one's brains, that is the choice one faces at certain moments. In any case, the only real dignity is that of exclusion.

Love is ever the beginning of Knowledge as fire is of light.

Carnap made a detailed analysis of Heidegger's statement, "Nothing nihilates," in order to show that it is purely verbal, devoid of empirical meaning. (Incidentally, this is the only sentence from existentialist philosophy the majority of contemporary positivists appear familiar with.)

The mind intent upon resolving as well as compounding the concept of a composite demands and presumes boundaries in which it may acquiesce in the former as well as in the latter direction.

Do not imagine that there is any bird more easily caught by decoy, nor any fish sooner fixed on the hook by wormy bait, than are all these poor fools neatly tricked into servitude by the slightest feather passed, so to speak, before their mouths. Truly it is a marvelous thing that they let themselves be caught so quickly at the slightest tickling of their fancy. Plays, farces, spectacles, gladiators, strange beasts, medals, pictures, and other such opiates, these were for ancient peoples the bait toward slavery, the price of their liberty, the instruments of tyranny. By these practices and enticements the ancient dictators so successfully lulled their subjects under the yoke, that the stupefied peoples, fascinated by the pastimes and vain pleasures flashed before their eyes, learned subservience as naïvely, but not so creditably, as little children learn to read by looking at bright picture books.

Behind the stream of my mind and body, behind the stream of my race and all mankind, behind the stream of plants and animals, I watch with trembling the Invisible, treading on all visible things and ascending. Behind his heavy and blood-splattered feet I hear all living things being trampled on and crushed. His face is without laughter, dark and silent, beyond joy and sorrow, beyond hope.

Yet its essence was the certitude that his life was not totally at the mercy of chance. Somehow, it was more important than that. This sense of power inside his head - which he could intensify by pulling a face and wrinkling up the muscles of his forehead - aroused a glow of optimism, an expectation of exciting events. He knew that for him, fate held something special in store.

It would be silly, of course, to be either 'for' or 'against' modernity tout court, not only because it is pointless to try to stop the development of technology, science, and economic rationality, but because both modernity and antimodernity may be expressed in barbarous and antihuman terms.

Since my logic aims to teach and instruct the understanding, not that it may with the slender tendrils of the mind snatch at and lay hold of abstract notions (as the common logic does), but that it may in very truth dissect nature, and discover the virtues and actions of bodies, with their laws as determined in matter; so that this science flows not merely from the nature of the mind, but also from the nature of things.

Our aim is precisely to establish the human kingdom as a pattern of values in distinction from the material world. But the subjectivity which we thus postulate as the standard of truth is no narrowly individual subjectivism, for as we have demonstrated, it is not only one's own self that one discovers in the cogito, but those of others too. Contrary to the philosophy of Descartes, contrary to that of Kant, when we say "I think" we are attaining to ourselves in the presence of the other, and we are just as certain of the other as we are of ourselves. Thus the man who discovers himself directly in the cogito also discovers all the others, and discovers them as the condition of his own existence. He realizes that he can't be anything unless others recognize him as such. I cannot obtain any truth whatsoever about myself, except through the mediation of another. The other is indispensable to my existence, and equally so to any knowledge I can have of myself.

One sticks one's finger into the soil to tell by the smell in what land one is: I stick my finger in existence - it smells of nothing. Where am I? Who am I? How came I here? What is this thing called the world? What does this world mean? Who is it that has lured me into the world? Why was I not consulted, why not made acquainted with its manners and customs instead of throwing me into the ranks, as if I had been bought by a kidnapper, a dealer in souls? How did I obtain an interest in this big enterprise they call reality? Why should I have an interest in it? Is it not a voluntary concern? And if I am to be compelled to take part in it, where is the director? I should like to make a remark to him. Is there no director? Whither shall I turn with my complaint?

Where is the prince sufficiently educated to know that for seventeen hundred years the Christian sect has done nothing but harm?

Those who have handled sciences have been either men of experiment or men of dogmas. The men of experiment are like the ant, they only collect and use; the reasoners resemble spiders, who make cobwebs out of their own substance. But the bee takes a middle course: it gathers its material from the flowers of the garden and of the field, but transforms and digests it by a power of its own. Not unlike this is the true business of philosophy; for it neither relies solely or chiefly on the powers of the mind, nor does it take the matter which it gathers from natural history and mechanical experiments and lay it up in the memory whole, as it finds it, but lays it up in the understanding altered and digested. Therefore from a closer and purer league between these two faculties, the experimental and the rational (such as has never yet been made), much may be hoped.

Art thy not content that thou hast done something conformable to thy nature, and dost thou seek to be paid for it? Just as if the eye demanded recompense for seeing, or the feet for walking. For as these members are formed for a particular purpose... so also is man formed by nature to acts of benevolence.

The middle sort of historians (of which the most part are) spoil all; they will chew our meat for us.

Existence would be a quite impracticable enterprise if we stopped granting importance to what has none.

The criterion of efficiency dictates that choice of alternatives which produces the largest result for the given application of resources.

Unto whomsoever much is given, of him shall be much required: and to whom men have committed much, of him they will ask the more.

Being is only Being for Dasein.

Men are most apt to believe what they least understand.

Historical time knows no lasting present.

After the battle in Pharsalia, when Pompey was fled, one Nonius said they had seven eagles left still, and advised to try what they would do. "Your advice," said Cicero, "were good if we were to fight jackdaws."

The most taboo issue on U.S. campuses these days, in many instances, has to do with the vicious Israeli occupation of precious Palestinians. It's very difficult to have a respectful, robust conversation about that. And I am unequivocal in my solidarity with Palestinian brothers and sisters... I'm not in any way going to stop talking about the Palestinian plight and predicament.

States as great engines move slowly.

The point is, not how long you live, but how nobly you live. And often this living nobly means that you cannot live long.

Thus is man that great and true Amphibium, whose nature is disposed to live not only like other creatures in diverse elements, but in divided and distinguished worlds.

We term sleep a death, and yet it is waking that kills us, and destroys those spirits that are the house of life.

So monstrous is the making and keeping them slaves at all, abstracted from the barbarous usage they suffer, and the many evils attending the practice; as selling husbands away from wives, children from parents, and from each other, in violation of sacred and natural ties; and opening the way for adulteries, incests, and many shocking consequences, for all of which the guilty Masters must answer to the final Judge.

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

One of the most marked features about the law of mind is that it makes time to have a definite direction of flow from past to future. ...This makes one of the great contrasts between the law of mind and the law of physical force, where there is no more distinction between the two opposite directions in time than between moving northward and moving southward.

To love truth for truth's sake is the principal part of human perfection in this world, and the seed-plot of all other virtues.

We do not count a man's years until he has nothing else to count.

Who dismisses his adulterous wife and marries another woman, whereas his first wife still lives, remains perpetually in the state of adultery. Such a man does not any efficacious penance while he refuses to abandon the new wife. If he is a catechumen, he cannot be admitted to baptism, because his will remains rooted in the evil. If he is a (baptized) penitent, he cannot receive the (ecclesiastical) reconciliation as long as he does not break with his bad attitude.