Singleness of purpose is essential for success in life.

A man's wealth must be determined by the relation of his desires and expenditures to his income. If he feels rich on ten dollars, and has everything else he desires, he really is rich.

Save when you can and not when you have to.

I'm glad I wrote the book to show what I found out about the [ Standard Oil Company]. I'm glad many people read my book and found out the truth.

Character - not wealth, power, or position - is the supreme word.

Own nothing, control everything.

I know of nothing more despicable and pathetic than a man who devotes all the hours of the waking day to the making of money for money's sake.