An understanding of the natural world is a source of not only great curiosity, but great fulfilment.
The only real laughter comes from despair.
A perfection of means, and confusion of aims, seems to be our main problem.
He that cannot reason is a fool. He that will not is a bigot. He that dare not is a slave.
The pendulum of the mind oscillates between sense and nonsense, not between right and wrong.
Sometimes one creates a dynamic impression by saying something, and sometimes one creates as significant an impression by remaining silent.
Whatever you think the world is withholding from you, you are withholding from the world.
Doubt is the origin of wisdom
Anywhere you go in the world is what you make of it, not what you read in books.
Man's sensitivity to the little things and insensitivity to the greatest are the signs of a strange disorder.
I believe that one defines oneself by reinvention. To not be like your parents. To not be like your friends. To be yourself. To cut yourself out of stone.
A man who as a physical being is always turned toward the outside, thinking that his happiness lies outside him, finally turns inward and discovers that the source is within him.
The noblest pleasure is the joy of understanding.
Wonder is the beginning of wisdom.
A mistake is always forgivable, rarely excusable and always unacceptable.
Good means not merely not to do wrong, but rather not to desire to do wrong.
All that we see or seem is but a dream within a dream.
Adapt what is useful, reject what is useless, and add what is specifically your own.
Never put off for tomorrow, what you can do today.
Choose rather to be strong of soul than strong of body.
Be curious, not judgmental.