The secret of happiness is to face the fact that the world is horrible, horrible, horrible.

Happiness is not best achieved by those who seek it directly.

Having made the decision, do not revise it unless some new fact comes to your knowledge. Nothing is so exhausting as indecision, and nothing is so futile.

Of all forms of caution, caution in love is perhaps the most fatal to true happiness.

For over two thousand years it has been the custom among earnest moralists to decry happiness as something degraded and unworthy

All the conditions of happiness are realized in the life of the man of science.