The only real mistake is the one from which we learn nothing.

The noblest pleasure is the joy of understanding.

But the fact that some geniuses were laughed at does not imply that all who are laughed at are geniuses. They laughed at Columbus, they laughed at Fulton, they laughed at the Wright brothers. But they also laughed at Bozo the Clown.

There are things known and there are things unknown, and in between are the doors of perception.

Yesterday is but today's memory and tomorrow is today's dream.

Tis very certain the desire of life prolongs it.

Think no vice so small that you may commit it, and no virtue so small that you may over look it.

I am a lover of truth, a worshipper of freedom, a celebrant at the altar of language and purity and tolerance.

There is an art, or rather a knack to flying. The knack lies in learning how to throw yourself at the ground and miss.

Between stimulus and response there is a space. In that space is our power to choose our response. In our response lies our growth and our freedom.

It is neither good nor bad, but thinking makes it so.

Intellectuals solve problems, geniuses prevent them.

In a good bookroom you feel in some mysterious way that you are absorbing the wisdom contained in all the books through your skin, without even opening them.

Our virtues and our failings are inseparable, like force and matter. When they separate, man is no more

Man is the only creature who refuses to be what he is.

He alone is free who lives with free consent under the entire guidance of reason.

Wisdom is not the product of schooling, but of the lifelong attempt to acquire it.

Share our similarities, celebrate our differences.

Although our intellect always longs for clarity and certainty, our nature often finds uncertainty fascinating.

Thoughts without content are empty, intuitions without concepts are blind.

Taste every fruit of every tree in the garden at least once. It is an insult to creation not to experience it fully. Temperance is wickedness.