As long as human labor power, and, consequently, life itself, remain articles of sale and purchase, of exploitation and robbery, the principle of the “sacredness of human life” remains a shameful lie, uttered with the object of keeping the oppressed slaves in their chains.

The end may justify the means as long as there is something that justifies the end.

As long as I breathe I hope. As long as I breathe I shall fight for the future, that radiant future, in which man, strong and beautiful, will become master of the drifting stream of his history and will direct it towards the boundless horizons of beauty, joy and happiness!

Learning carries within itself certain dangers because out of necessity one has to learn from one's enemies.

Life is beautiful. Let the future generations cleanse it of all evil, oppression, and violence, and enjoy it to the full.

Dialectical thought is related to vulgar thinking in the same way that a motion picture is related to a still photograph. The motion picture does not outlaw the still photograph but combines a series of them according to the laws of motion.

You are pitiful isolated individuals; you are bankrupts; your role is played out. Go where you belong from now on - into the dustbin of history!