Toleration is the greatest gift of the mind; it requires the same effort of the brain that it takes to balance oneself on a bicycle.

No pessimist ever discovered the secret of the stars, or sailed to an uncharted land, or opened a new doorway for the human spirit.

Masculine exhalations are, as a rule, stronger, more vivid,more widely differentiated than those of women. In the odor of young men there is something elemental, as of fire, storm, and salt sea. It pulsates with buoyancy and desire. It suggests all the things strong and beautiful and joyous and gives me a sense of physical happiness.

We should respect all people.

I know no study that will take you nearer the way to happiness than the study of nature - and I include in the study of nature not only things and their forces, but also mankind and their ways, and the moulding of the affections and the will into an earnest desire not only to be happy, but to create happiness.

Often we look so long at the closed door that we do not see the one that has been opened for us.

Happiness is the final and perfect fruit of obedience to the laws of life.