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He who has so little knowledge of human nature as to seek happiness by changing anything but his own disposition will waste his life in fruitless efforts.

Almost every man wastes part of his life attempting to display qualities which he does not possess.

If a man has not discovered something that he will die for, he isn't fit to live.

Any man who does not accept the conditions of life sells his soul.

The unexamined life is not worth living.

A man who views the world the same at fifty as he did at twenty has wasted thirty years of his life.

The darkest hour in any man's life is when he sits down to plan how to get money without earning it.

A man who becomes conscious of the responsibility he bears toward a human being who affectionately waits for him, or to an unfinished work, will never be able to throw away his life. He knows the 'why' for his existence, and will be able to bear almost any 'how.'

No man, who continues to add something to the material, intellectual and moral well-being of the place in which he lives, is left long without proper reward.