Quote by Leon Trotsky

"Life is not an empty abstraction in which man is free to move about in any direction he pleases."

"The permanent revolution, so to speak, is the derivative of the law of uneven and combined development of mankind."

"Defeatism is the enemy of the revolution."

"Without a revolutionary theory there can be no revolutionary movement."

"Science helps us understand the world."

"I've witnessed the birth of science, and it continues to amaze me."

"I'm something of a scientist myself."

"The fusion process is self-sustaining now!"