Medicine, the only profession that labors incessantly to destroy the reason for its existence.

Three-fourths of the mistakes a man makes are made because he does not really know what he thinks he knows.

No wonder that, when a political career is so precarious, men of worth and capacity hesitate to embrace it. They cannot afford to be thrown out of their life’s course by a mere accident.

If you have enough room for your books, you don’t have enough books.

The ordinary American voter does not object to mediocrity. He likes his candidate to be sensible, vigorous, and, above all, what he calls ‘magnetic,’ and does not value, because he sees no need for, originality or profundity, a fine culture or a wide knowledge.

In Europe we have cities wealthier and more populous than yours and we are not happy. You dream of your posterity; but your posterity will look back to yours as the golden age, and envy those who first burst into this silent, splendid Nature...

The national park is the best idea America ever had.

The ordinary American voter does not object to mediocrity. He likes his candidate to be sensible, vigorous, and, above all, what he calls 'magnetic,' and does not value, because he sees no need for, originality or profundity, a fine culture or a wide knowledge.

Individualism, the love of enterprise, and the pride in personal freedom, have been deemed by Americans not only as their choicest, but their peculiar and exclusive possessions.

Communication is the key to education, understanding and peace.