| Reason has always existed, but not always in a reasonable form. |
| The increase in value of the world of things is directly proportional to the decrease in value of the human world. |
| To be radical is to grasp things by the root. |
| Communism is the riddle of history solved, and it knows itself to be this solution. |
| Labor in the white skin can never free itself as long as labor in the black skin is branded. |
| Money is the alienated essence of man's labor and life, and this alien essence dominates him as he worships it. |
| Merely quantitative differences, beyond a certain point, pass into qualitative changes. |
| I am nothing but I must be everything. |
| The proletarians have nothing to loose but their chains. They have a world to win. |
| Machinery, which is not used, is not capital. |
| Necessity is blind until it becomes conscious. Freedom is the consciousness of necessity. |
| If anything is certain, it is that I myself am not a Marxist. |
| An abundance of good friends does not lead to better philosophy. |
| The more of himself man attributes to God, the less he has left in himself. |
The education of all children, from the moment that they can get along without a mother's care, shall be in state institutions.
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| There is no royal road to science, and only those who do not dread the fatiguing climb of its steep paths have a chance of gaining its luminous summits. |
| Moments are the elements of profit. |
| The ruling ideas of each age have ever been the ideas of its ruling class. |
