What's real and what's true aren't necessarily the same.

Criticize the act, not the person.

I think, therefore I am.

Whatever you think the world is withholding from you, you are withholding from the world.

The experience gathered from books, though often valuable,is but the nature of learning whereas the experience gained from actual life is of the nature of wisdom.

Gravity is only the bark of wisdom's tree; but it preserves it

There's no sense in being precise when you don't even know what you're talking about.

Take care of the pieces well. The whole will take care of itself.

Real knowledge is to know the extent of one's ignorance.

Each day is a little life; every waking and rising a little birth; every fresh morning a little youth; every going to rest and sleep a little death.

There is nothing more uncommon than common sense.

Intelligence is the ability to adapt to change.

The future is uncertain but the end is always near.

You are the bows from which your children as living arrows are sent forth.

One who gains strength by overcoming obstacles possesses the only strength which can overcome adversity.

Stupidity is a talent for misconception.

To live is not merely to breathe; it is to act; it is to make use of our organs, senses, faculties - of all those parts of ourselves which give us the feeling of existence

Everybody is ignorant, only on different subjects.

A man may imagine things that are false, but he can only understand things that are true.

A wise man can learn more from a foolish question than a fool can learn from a wise answer.

The secret of life, though, is to fall seven times and to get up eight times.