Society is a sort of organism on the growth of which conscious efforts can exercise little effect.

Philosophy studies the world, but the point is to change it.

...the Communists everywhere support every revolutionary movement against the existing social and political order of things... They openly declare that their ends can be attained only by the forcible overthrow of all existing social conditions.

Medicine heals doubts as well as diseases.

Do not be deluded by the abstract word Freedom. Whose freedom? Not the freedom of one individual in relation to another, but freedom of Capital to crush the worker.

The philosophers have only interpreted the world, in various ways: the point, however, is to change it.

Every provisional political set-up following a revolution requires a dictatorship, and an energetic dictatorship at that.