The happiest people in this world are those who have the most interesting thoughts.

A middle-aged cat will often play as unreservedly as a kitten, though he knows perfectly well it is only a game.

Every time you acquire a new interest, even more, a new accomplishment, you increase your power of life.

The final test of a gentleman is his respect for those who can be of no possible service to him.

Herein lies the real value of education. Advanced education may or may not make men and women more efficient; but it enriches personality, increases the wealth of the mind, and hence brings happiness. It is the finest insurance against old age, against the growth of physical disability, of the lack and loss of animal delights.

The principle of happiness should be like the principle of virtue: it should not be dependent of things, but be a part of personality [and character].

Real happiness is not dependent on external things. The pond is fed from within. The kind of happiness that stays with you is the happiness that springs from inward thoughts and emotions. You must cultivate your mind if you wish to achieve enduring happiness.