One of the most difficult tasks confronting philosophers is to descend from the world of thought to the actual world.

It is absolutely impossible to transcend the laws of nature. What can change in historically different circumstances is only the form in which these laws expose themselves.

Revolutions are the locomotives of history.

Nothing can have value without being an object of utility.

All freed, fast-frozen relations, with their train of ancient and venerable prejudices and opinions, are swept away, all new-formed ones become antiquated before they can ossify. All that is solid melts into air, all that is holy is profaned, and man is at last compelled to face with sober senses, his real conditions of life, and his relations with his kind.

It would perhaps be as well if things were to remain quiet for a few years yet, so that all this 1848 democracy has time to rot away.

We know that violent measures against religion are nonsense; but this is an opinion: as socialism grows, religion will disappear. Its disappearance must be done by social development, in which education must play a part.