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.

A student never forgets an encouraging private word, when it is given with sincere respect and admiration.

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

A well-ordered life is like climbing a tower; the view halfway up is better than the view from the base, and it steadily becomes finer as the horizon expands.

In a start-up company, you basically throw out all assumptions every three weeks.

The teacher should make a concerted effort never to lose his temper in the presence of the class. If a man, he may take refuge in profane soliloquies. If a woman, she may follow the example of one sweet-faced tranquil girl who went out in the yard and gnawed a post.

I find daily life not always joyous, but always interesting. I have some sad days and nights, but none that are dull. As I advance deeper into the vale of years, I live with constantly increasing gusto and excitement. I am sure it all means something; in the last analysis, I am an optimist because I believe in God. Those who have no faith are quite naturally pessimists and I do not blame them.