The bargain that yields mutual satisfaction is the only one that is apt to be repeated.

I have never seen people who could do real work except under the stimulus of encouragement and enthusiasm and the approval of the people for whom they are working.

It is when things go hardest, when life becomes most trying, that there is greatest need for having a fixed goal.

Many of the most successful men I have known have never grown up. They have retained bubbling-over boyishness. They have relished wit, they have indulged in humor. They have not allowed ‘dignity’ to depress them into moroseness. Youthfulness of spirit is the twin brother of optimism, and optimism is the stuff of which American business success is fashioned. Resist growing up!

Work is the meat of life, pleasure the dessert.

Madame Curie didn't stumble upon radium by accident. She searched and experimented and sweated and suffered years before she found it. Success rarely is an accident.

Courtesy is doing that which nothing under the sun makes you do but human kindness. Courtesy springs from the heart; if the mind prompts the action, there is a reason; if there be a reason, it is not courtesy, for courtesy has no reason. Courtesy is good will, and good will is prompted by the heart full of love to be kind. Only the generous man is truly courteous. He gives freely without a thought of receiving anything in return.