Who said "The duty of a revolutionary is not to be comfortable."?

This quote is attributed to Fidel Castro.

The duty of a revolutionary is not to be comfortable. - Fidel Castro

"The duty of a revolutionary is not to be comfortable."

Fidel Castro

President, Revolutionary Leader Cuban 1926–2016

"A revolution is not a bed of roses."

"Condemn me, it does not matter. History will absolve me."

"The revolution is not an apple that falls when it is ripe. You have to make it fall."

"I am a Marxist-Leninist and will be one until the day I die."