Your greatest pleasure is that which rebounds from hearts that you have made glad.

Involved sentences, crooked, circuitous, and parenthetical, no matter how musically they may be balanced, are prejudicial to a facile understanding of the truth.

A tool is but the extension of a man's hand, and a machine is but a complex tool. And he that invents a machine augments the power of a man and the well-being of mankind.

It's not work that kills [people], it is worry.

I don't like these cold, precise, perfect people, who, in order not to speak wrong, never speak at all, and in order not to do wrong, never do anything.

Grim care, moroseness, anxiety-all this rust of life ought to be scoured off by the oil of mirth. Mirth is God's medicine.

If a man harbors any sort of fear, it percolates through all his thinking, damages his personality, makes him landlord to a ghost.