To be able to concentrate for a considerable time is essential to difficult achievement.

Only mathematics and mathematical logic can say as little as the physicist means to say.

I feel as if one would only discover on one's death bed what one ought to have lived for

Even in the most purely logical realms, it is insight that first arrives at what is new.

The completely simultaneous and perfect possession of unlimited life at a single moment.

There is a kink in my damned brain that prevents me from thinking as other people think.

All the greatest achievements of mind have been beyond the power of unaided individuals.

There is one word which may serve as a rule of practice for all one's life -reciprocity.

The superior man understands what is right; the inferior man understands what will sell.

A man who has committed a mistake and does not correct it is committing another mistake.

By gaining the people, the kingdom is gained; by losing the people, the kingdom is lost.

Death and life have their determined appointments; riches and honors depend upon heaven.

Don’t complain about the snow on your neighbor’s roof when your own doorstep is unclean.

Don't worry about being acknowledged by others; worry about failing to acknowledge them.

The demands that a great man makes are on himself; those of a petty man are upon others.

A good man will certainly also possess courage; but a brave man is not necessarily good.

The only proof for the existence of God is that without God you couldn't prove anything.

One of the hardest things in the world is to be right and not hurt other people with it.

The heights of popularity and patriotism are still the beaten road to power and tyranny.

Happiness does not reside in strength or money; it lies in rightness and many-sidedness.

Aristotle dines when it seems good to King Philip, but Diogenes when he himself pleases.

To be in harmony with the wholeness of things is not to have anxiety over imperfections.

A flower falls, even though we love it; and a weed grows, even though we do not love it.

Do not doubt that mountains walk simply because they may not appear to walk like humans.

An 'I' without a body is a possibility. But a body without an 'I' is utterly impossible.

It is the nature of the wise to resist pleasures, but the foolish to be a slave to them.

Far more critical than what we know or what we don't know is what we don't want to know.

Man is the only creature that strives to surpass himself, and yearns for the impossible.

Unless a man has the talents to make something of himself, freedom is an irksome burden.

The urge to escape our real self is also an urge to escape the rational and the obvious.

There is a close connection between lack of confidence and the passionate state of mind.

We are least open to precise knowledge concerning the things we are most vehement about.

The aspiration toward freedom is the most essentially human of all human manifestations.

There is no reason why humanity cannot be served equally by weighty and trivial motives.

...in the shaping of a life, chance and the ability to respond to chance are everything.

The important part of Marxism was its demand for active, constant, practical, class-war.

The essence of the religious emotions consists in the feeling of an absolute dependence.

Irony gives us, at little expense, the impression that we are experienced psychologists.

Science and knowledge, especially that of philosophy, came from the Arabs into the West.

He who says there is no such thing as an honest man, you may be sure is himself a knave.

Religion in its humility restores man to his only dignity, the courage to live by grace.

To know what people really think, pay regard to what they do, rather than what they say.

It is always pleasant to be urged to do something on the ground that one can do it well.

The more rational an institution is the less it suffers by making concessions to others.

A sanctity hangs about the sources of our being, whether physical, social, or imaginary.

Half our standards come from our first masters, and the other half from our first loves.

Before you contradict an old man, my fair friend, you should endeavor to understand him.

The business of thinking ... undoes every morning what it had finished the night before.

And I also see how this body influences external images: it gives back movement to them.

We are never more discontented with others than when we are discontented with ourselves.

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