The commercial spirit is the spirit of profit, not patriotism; of credit, not honor; of individual gain, not national prosperity; of trade and dickering, not principle.

We know that there is no absolute knowledge, that there are only theories; but we forget this. The better educated we are, the harder we believe in axioms.

The unknown is the province of the student; it is the field for his lifes adventure, and it is a wide field full of beckonings

I have been contending all my life, and always with God.

If my father could watch my son for a while, he might realize his own immortality.

My father was slower, but he was severer than my mother, who was quick but light and irregular in discipline.

The only thing worth having in an earthly existence is a sense of humor.