If you want new ideas, read old books.

Gradualness and discipline. This is the most important thing. From the very beginning of your work, train yourself to the strictest gradualness in accumulating knowledge.

Never think that you already know all. However highly you are appraised, always have the courage to say of yourself: I am ignorant.

I will not sacrifice even the hind leg of a frog to the kind of social experiment that the Communist government is conducting in Russia.

The consequences of an act affect the probability of its occurring again.

-- B. F. Skinner

Political power grows out of the barrel of a gun.

-- Mao Zedong

A revolution is not a dinner party, or writing an essay, or painting a picture, or doing embroidery. It cannot be so refined, so leisurely and gentle, so temperate, kind, courteous, restrained and magnanimous. A revolution is an insurrection, an act of violence by which one class overthrows another.

-- Mao Zedong