"The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well."
"The crowning fortune of a man is to be born to some pursuit which finds him employment and happiness, whether it be to make baskets, or broadswords, or canals, or statues, or songs."
"If the stars should appear but one night every thousand years how man would marvel and adore."
"Men love to wonder, and that is the seed of science."
"All life is an experiment. The more experiments you make the better."
"Life consists of what man is thinking about all day."