The vanity of the passing world and love are the two fundamental and heart-penetrating notes of true poetry. And they are two notes of which neither can be sounded without causing the other to vibrate. The feeling of the vanity of the passing world kindles love in us, the only thing that triumphs over the vain and transitory, the only thing that fills life again and eternalizes it.

What matter and opportunity [for thy activity] art thou avoiding? For what else are all these things, except exercises for the reason, when it has viewed carefully and by examination into their nature the things which happen in life? Persevere then until thou shalt have made these things thy own, as the stomach which is strengthened makes all things its own, as the blazing fire makes flame and brightness out of everything that is thrown into it.

The following general definition of an animal: a system of different organic molecules that have combined with one another, under the impulsion of a sensation similar to an obtuse and muffled sense of touch given to them by the creator of matter as a whole, until each one of them has found the most suitable position for it shape and comfort.

Mucius might have accomplished something more successful in that camp, but never anything more brave.

You are a little soul carrying a corpse around, as Epictetus used to say.

Your favour of July 31, was duly received, and was read with peculiar pleasure. The sentiments breathed through the whole do honor to both the head and heart of the writer. Mine on the subject of slavery of negroes have long since been in possession of the public, and time has only served to give them stronger root. The love of justice and the love of country plead equally the cause of these people, and it is a moral reproach to us that they should have pleaded it so long in vain, and should have produced not a single effort, nay I fear not much serious willingness to relieve them & ourselves from our present condition of moral & political reprobation.

Classical science was based upon the belief that it is possible to formulate both the position and velocity at one time of any given particle. It followed that knowledge of the position and velocity of a given number of particles would enable the future behavior of the whole collection to be accurately predicted. The principle of Heisenberg is that given the determination of position, its velocity can be stated only as of a certain order of probability, while if its velocity is determined the correlative factor of position can be stated only as of a certain order of probability. Both cannot be determined at once, from which it follows necessarily that the future of the whole collection cannot possibly be foretold except in terms of some order of probability.

So-called professional mathematicians have, in their reliance on the relative incapacity of the rest of mankind, acquired for themselves a reputation for profundity very similar to the reputation for sanctity possessed by theologians.

Now about your family. Do you know that since your daughter came out everyone has been enraptured by her? They say she is amazingly beautiful.

In theory, it matters little to me whether I live as whether I die; in practice, I am lacerated by every anxiety which opens an abyss between life and death.

What is this wide-spread component of the surface of the earth? and whence did it come? You may think this no very hopeful inquiry. You may not unnaturally suppose that the attempt to solve such problems as these can lead to no result, save that of entangling the inquirer in vague speculations, incapable of refutation and of verification. If such were really the case, I should have selected some other subject than a "piece of chalk" for my discourse. But, in truth, after much deliberation, I have been unable to think of any topic which would so well enable me to lead you to see how solid is the foundation upon which some of the most startling conclusions of physical science rest.

To think that so many have succeeded in dying!

If what we are discussing were a point of law or of the humanities, in which neither true nor false exists, one might trust in subtlety of mind and readiness of tongue and in the greater experience of the writers, and expect him who excelled in those things to make his reasoning most plausible, and one might judge it to be the best. But in the natural sciences, whose conclusions are true and necessary and have nothing to do with human will, one must take care not to place oneself in the defense of error; for here a thousand Demostheneses and a thousand Aristotles would be left in the lurch by every mediocre wit who happened to hit upon the truth for himself. Therefore, Simplicio, give up this idea and this hope of yours that there may be men so much more learned, erudite, and well-read than the rest of us as to be able to make that which is false become true in defiance of nature.

As we speak cruel time is fleeing. Seize the day, believing as little as possible in the morrow.

The doctrines of Jesus are simple, and tend all to the happiness of man.

Philosophers do not claim that God does not know particulars; they rather claim that He does not know them the way humans do. God knows particulars as their Creator whereas humans know them as a privileged creations of God might know them.

I have said that, in a sense, the parasites were a 'shadow' of man's cowardice and passivity. Their strength could increase in an atmosphere of defeat and panic, for it fed on human fear. In that case, the best way to combat them was to change the atmosphere to one of strength and purpose.

I know that my birth is fortuitous, a laughable accident, and yet, as soon as I forget myself, I behave as if it were a capital event, indispensable to the progress and equilibrium of the world.

Conformity is an imitation of grace.

Speech is insufficient to utter the last things; and this troubles it not, because the last things may be heard speaking for themselves. At last, after long delay the wondering soul gives form to that which is stirring within it and produces its works art and song and mighty deeds.

He did not, and could not, understand the meaning of words apart from their context. Every word and action of his was the manifestation of an activity unknown to him, which was his life.

It is wrong to think that belief in freedom always leads to victory; we must always be prepared for it to lead to defeat. If we choose freedom, then we must be prepared to perish along with it. Poland fought for freedom as no other country did. The Czech nation was prepared to fight for its freedom in 1938; it was not lack of courage that sealed its fate. The Hungarian Revolution of 1956 - the work of young people with nothing to lose but their chains - triumphed and then ended in failure. ... Democracy and freedom do not guarantee the millennium. No, we do not choose political freedom because it promises us this or that. We choose it because it makes possible the only dignified form of human coexistence, the only form in which we can be fully responsible for ourselves. Whether we realize its possibilities depends on all kinds of things - and above all on ourselves.

It must not be supposed that the subjective elements are any less 'real' than the objective elements; they are only less important... because they do not point to anything beyond ourselves...

All characteristics of material things as they are presented to us in the acts of external perception (e.g. colour) are endowed with the separateness of spatial extension, but it is only when we build up a single connected real world out of all our experiences that the spatial extension, which is a constituent of every perception, becomes a part of one and the same all-inclusive space. ... every material thing can, without changing content, equally well occupy a position in Space different from its present one. This immediately gives us the property of the homogeneity of space which is the root of the conception, Congruence.

Drunkenness is nothing but voluntary madness.

What, then, of human activities? Is humankind itself hastening its own end? Man has, for instance, been burning carbon-containing fuel — wood, coal, oil, gas — at a steadily accelerating rate. All these fuels form carbon dioxide. Some is absorbed by plants and the oceans but not as fast as it is produced. This means the carbon dioxide content of the air is going up — slightly but nevertheless up. Carbon dioxide retains heat, and even a small rise means a warming of the Earth's atmosphere. This may result in the melting of the polar ice caps with unusual speed, flooding the world before we have learned climate control. In reverse, our industrial civilization is making our atmosphere dustier so that it reflects more sunlight away and cools the Earth slightly — thus making possible a glacial advance in a few centuries, also before we have learned climate control.

Equity knows no difference of sex. In its vocabulary the word man must be understood in a generic, and not in a specific sense.

God offers to every mind its choice between truth and repose.

If we are serious about peace, then we must work for it as ardently, seriously, continuously, carefully, and bravely as we have ever prepared for war.

Some day you will be old enough to start reading fairy tales again.

The really good music, whether of the East or of the West, cannot be analyzed.

There is probably no more abused a term in the history of philosophy than "representation," and my use of this term differs both from its use in traditional philosophy and from its use in contemporary cognitive psychology and artificial intelligence.... The sense of "representation" in question is meant to be entirely exhausted by the analogy with speech acts: the sense of "represent" in which a belief represents its conditions of satisfaction is the same sense in which a statement represents its conditions of satisfaction. To say that a belief is a representation is simply to say that it has a propositional content and a psychological mode.

Believing that the happiness of mankind is best promoted by the useful pursuits of peace, that on these alone a stable prosperity can be founded, that the evils of war are great in their endurance, and have a long reckoning for ages to come, I have used my best endeavors to keep our country uncommitted in the troubles which afflict Europe, and which assail us on every side. Letter to the Young Republicans of Pittsburg and its vicinities

It seems as if the female spirit of the world were mourning everlastingly over blessings, not lost, but which she has never had, and which, in her discouragement she feels that she never will have, they are so far off.

To whomever gives a kiss or a blowRender a kiss or blow, but to whomever gives when you are unable to return, offer all the hatred in your hear, for you were slaves and he enslaves you.

If you have a faith, it is statistically overwhelmingly likely that it is the same faith as your parents and grandparents had. No doubt soaring cathedrals, stirring music, moving stories and parables, help a bit. But by far the most important variable determining your religion is the accident of birth. The convictions that you so passionately believe would have been a completely different, and largely contradictory, set of convictions, if only you had happened to be born in a different place. Epidemiology, not evidence.

All passions that suffer themselves to be relished and digested are but moderate.

No passion so effectually robs the mind of all its powers of acting and reasoning as fear.

That Marxism should triumph in Russia, where there is no industry, would be the greatest contradiction that Marxism could undergo. But there is no such contradiction, for there is no such triumph. Russia is Marxist more or less as the Germans of the Holy Roman Empire were Romans.

The history of utopias is no less fascinating than the history of metallurgy or of chemical engineering.

Every philosophy is complete in itself and, like a genuine work of art, contains the totality. Just as the works of Apelles and Sophocles, if Raphael and Shakespeare had known them, should not have appeared to them as mere preliminary exercises for their own work, but rather as a kindred force of the spirit, so, too reason cannot find in its own earlier forms mere useful preliminary exercises for itself.

I think television has betrayed the meaning of democratic speech, adding visual chaos to the confusion of voices. What role does silence have in all this noise?

Without the faculty of forgetting, our past would weigh so heavily on our present that we should not have the strength to confront another moment, still less to live through it. Life would be bearable only to frivolous natures, those in fact who do not remember.