Since only what is material is perceptible, knowable, nothing is known of the existence of God.

The task is not just to understand the world but to change it.

The ideas of the ruling class are in every epoch the ruling ideas, i.e., the class which is the ruling material force of society, is at the same time its ruling intellectual force.

Men can see nothing around them that is not their own image; everything speaks to them of themselves. Their very landscape is alive.

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

Be aware that the reward for labour, and quantity of labour, are quite disparate things.

Men's ideas are the most direct emanations of their material state.