The meaning of peace is the absence of opposition to socialism.

All social life is essentially practical. All mysterious which lead theory to mysticism find their rational solution in human practice and in the comprehension of the practice.

Workers of the world unite! You have nothing to lose but your chains.

I wish I knew why I am so anguished.

People think they know you. They know the things about you that you have forgotten.

We can know only that we know nothing. And that is the highest degree of human wisdom.