Shut out the evil love of the world, that you may be filled with the love of God. You are a vessel that was already full: you must pour away what you have, that you may take in what you have not.

What I will be remembered for are the Foundation Trilogy and the Three Laws of Robotics. What I want to be remembered for is no one book, or no dozen books. Any single thing I have written can be paralleled or even surpassed by something someone else has done. However, my total corpus for quantity, quality and variety can be duplicated by no one else. That is what I want to be remembered for.

All poetry is misrepresentation.

To-day unbind the captive, So only are ye unbound; Lift up a people from the dust, Trump of their rescue, sound!

The defiance of established authority, religious and secular, social and political, as a world-wide phenomenon may well one day be accounted the outstanding event of the last decade.

Nothing is ever gotten out of nothing by divine power.

It is our interest and our task to make the revolution permanent until all the more or less propertied classes have been driven from their ruling positions, until the proletariat has conquered state power and until the association of the proletarians has progressed sufficiently far - not only in one country but in all the leading countries of the world - that competition between the proletarians of these countries ceases and at least the decisive forces of production are concentrated in the hands of the workers. Our concern cannot simply be to modify private property, but to abolish it, not to hush up class antagonisms but to abolish classes, not to improve the existing society but to found a new one.

Several excuses are always less convincing than one.

And as to you, Sir, treacherous in private friendship (for so you have been to me, and that in the day of danger) and a hypocrite in public life, the world will be puzzled to decide whether you are an apostate or an impostor; whether you have abandoned good principles, or whether you ever had any. Letter to George Washington

It might otherwise appear paradoxical that money can be replaced by worthless paper; but that the slightest alloying of its metallic content depreciates it.

What we principally thought of, was to alter people's opinions; to make them believe according to evidence, and know what was their real interest, which when they once knew, they would, we thought, by the instrument of opinion, enforce a regard to it upon one another. While fully recognizing the superior excellence of unselfish benevolence and love of justice, we did not expect the regeneration of mankind from any direct action on those sentiments, but from the effect of educated intellect, enlightening the selfish feelings. Although this last is prodigiously important as a means of improvement in the hands of those who are themselves impelled by nobler principles of action, I do not believe that any one of the survivors of the Benthamites or Utilitarians of that day, now relies mainly upon it for the general amendment of human conduct.

Man is condemned to be free; because once thrown into the world, he is responsible for everything he does.

So clearly will truths kindle light for truths.

It is better; heavier, crueler. The mouth you wear for hell.

It is only by risking our persons from one hour to another that we live at all. And often enough our faith beforehand in an uncertified result is the only thing that makes the result come true.

Knowledge is the food of the soul; and we must take care, my friend, that the Sophist does not deceive us when he praises what he sells, like the dealers wholesale or retail who sell the food of the body; for they praise indiscriminately all their goods, without knowing what are really beneficial or hurtful.

Man cannot do without beauty, and this is what our era pretends to want to disregard. It steels itself to attain the absolute and authority; it wants to transfigure the world before having exhausted it, to set it to rights before having understood it. Whatever it may say, our era is deserting this world.

Do not despair: one thief was saved. Do not presume: one thief was damned.

As image and apprehension are in an organic unity, so, for a Christian, are human body and human soul.

It is very important to note that some 2,500 years ago at the least Pythagoras went from Samos to the Ganges to learn geometry...But he would certainly not have undertaken such a strange journey had the reputation of the Brahmins' science not been long established in Europe...

Competition for power is of two sorts: between organizations, and between individuals for leadership within an organization.

Here I stand; I can do no otherwise. God help me. Amen!

People who originally have no means but are ultimately able to earn a great deal, through whatever talents they may possess, almost always come to think that these are permanent capital and that what they gain through them is interest. Accordingly, they do not put aside part of their earnings to form a permanent capital, but spend their money as fast as they earn it. But they are then often reduced to poverty because their earnings decrease or come to an end after their talent, which was of a transitory nature, is exhausted, as happens, for example, in the case of almost all the fine arts; or because it could be brought to bear only under a particular set of circumstances that has ceased to exist.

It is better to fall in with crows than with flatterers; for in the one case you are devoured when dead, in the other case while alive.

Of all the cultural aspects of humanity, the only one which is not broken up into national or regional splinters is science. Different nations have different languages, they may have different religions, may have different dietaries, may have different holidays, different ways of thinking, but here's only one science. Interview by Richard Heffner on The Open Mind (19 June 1988); video (25:31)

For what is life but a play in which everyone acts a part until the curtain comes down?

How shall we define a god? Expressed in psychological terms (which are primary-there is no getting behind them) a god is something that gives us the peculiar kind of feeling which Professor Otto has called "numinous". Numinous feelings are the original god-stuff from which the theory-making mind extracts the individualised gods of the pantheon.

One who believes, as I do, that the free intellect is the chief engine of human progress, cannot but be fundamentally opposed to Bolshevism, as much as to the Church of Rome.

The object before us, to begin with, material production.

I am not asking anyone to accept Christianity if his best reasoning tells him that the weight of the evidence is against it.

...inversion...is an outlet that a child discovers when he is suffocating.

"Milton was right," said my Teacher. "The choice of every lost soul can be expressed in the words 'Better to reign in Hell than to serve in Heaven.' There is always something they insist on keeping even at the price of misery."

There is no more lovely, friendly and charming relationship, communion or company than a good marriage.

It is the mark of an educated man to look for precision in each class of things just so far as the nature of the subject admits; it is evidently equally foolish to accept probable reasoning from a mathematician and to demand from a rhetorician scientific proofs.

For in spite of language, in spite of intelligence and intuition and sympathy, one can never really communicate anything to anybody.

The chief function of the disciplinary power is to 'train', rather than to select and to levy; or, no doubt, to train in order to levy and select all the more. It does not link forces together in order to reduce them; it seeks to bind them together in such a way as to multiply and use them.

I believe in clear-cut positions. I think that the most arrogant position is this apparent, multidisciplinary modesty of "what I am saying now is not unconditional, it is just a hypothesis," and so on. It really is a most arrogant position. I think that the only way to be honest and expose yourself to criticism is to state clearly and dogmatically where you are. You must take the risk and have a position.

There is a connected set of events (light-waves) travelling outward from a centre... there are some respects in which all events are alike, and others in which they differ... We must not think of a light-wave as a 'thing', but as a connected group of rhythmical events. The mathematical characteristics of such a group can be inferred by physics, but the intrinsic character of the component events cannot be inferred.

I must confess that I am deeply troubled. I fear that human beings are intent upon acting out a vast deathwish and that it lies with us now to make every effort to promote resistance to the insanity and brutality of policies which encompass the extermination of hundreds of millions of human beings.

For the history of the centuries that have passed since the birth of Christ nowhere reveals conditions like those of the present. There has never been such building and planting in the world. There has never been such gluttonous and varied eating and drinking as now. Wearing apparel has reached its limit in costliness. Who has ever heard of such commerce as now encircles the earth? There have arisen all kinds of art and sculpture, embroidery and engraving, the like of which has not been seen during the whole Christian era. In addition men are so delving into the mysteries of things that today a boy of twenty knows more than twenty doctors formerly knew.

Of course God knew what would happen if they used their freedom the wrong way: apparently He thought it worth the risk.

If I negate powdered wigs, I am still left with unpowdered wigs.

Perhaps I am more than usually jealous with respect to my freedom. I feel that my connection with and obligation to society are still very slight and transient. Those slight labors which afford me a livelihood, and by which it is allowed that I am to some extent serviceable to my contemporaries, are as yet commonly a pleasure to me, and I am not often reminded that they are a necessity. So far I am successful. But I foresee, that, if my wants should be much increased, the labor required to supply them would become a drudgery. If I should sell both my forenoons and afternoons to society, as most appear to do, I am sure, that, for me, there would be nothing left worth living for. I trust that I shall never thus sell my birthright for a mess of pottage.

Value, therefore, does not stalk about with a label describing what it is.

Reason, if consulted with, would advise, that their children's time should be spent in acquiring what might be useful to them when they come to be men, rather than to have their heads stuff'd with a deal of trash, a great part whereof they usually never do ('tis certain they never need to) think on again as long as they live: and so much of it as does stick by them they are only the worse for.

Every step of real movement is more important than a dozen programmes.

A testimony is sufficient when it rests on: 1st. A great number of very sensible witnesses who agree in having seen well. 2d. Who are sane, bodily and mentally. 3d. Who are impartial and disinterested. 4th. Who unanimously agree. 5th. Who solemnly certify to the fact.

Since it is always the same person whose mind thinks, wills, and judges, the autonomous nature of these activities has created great difficulties. Reason's inability to move the will, plus the fact that thinking can only "understand" what is past what neither remove it nor "rejuvenate it" ... have led to the various doctrines asserting the mind's impotence and the force of the irrational, in brief to Hume's famous dictum that "Reason is and ought only to be the slave of the passions," that is, to a rather simple-minded reversal of the Platonic notion of reason's uncontested rulership in the household of the soul. What is so remarkable in all these theories and doctrines is their implicit monism, the claim that behind the obvious multiplicity of the world's appearances and, even more pertinently to our context, behind the obvious plurality of man's faculties and abilities, there must exist a oneness - the old hen pan, "the all is one" - either a single source or a single ruler.