The development of civilization and industry in general has always shown itself so active in the destruction of forests that everything that has been done for their conservation and production is completely insignificant in comparison.

Religion is the sigh of the oppressed creature, the heart of a heartless world, and the soul of soulless conditions. It is the opium of the people.

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

The social revolution...cannot draw its poetry from the past, but only from the future. It cannot begin with itself before it has stripped itself of all superstitions concerning the past.

Just as the savage must wrestle with nature to satisfy his wants, to maintain and reproduce life, so must civilised man, and he must do so in all social formations and under all possible modes of production.

Man makes religion, religion does not make man

Necessity is blind until it becomes conscious. Freedom is the consciousness of necessity.