III.
The materialistic doctrine that men are the products of conditions and education, different men therefore the products of other conditions and changed education, forgets that circumstances may be altered by men and that the educator has himself to be educated. It necessarily happens therefore that society is divided into two parts, of which one is elevated above society (Robert Owen for example).
The occurrence simultaneously of a change in conditions and human activity can only be comprehended and rationally understood as a revolutionary fact.
IV.
Feuerbach proceeds from a religious self-alienation, the duplication of the world into a religious, imaginary, and a real world. His work consists in the discovery of the material foundations of the religious world. He overlooked the fact that after carrying this to completion the important matter still remains unaccomplished. The fact that the material foundation annuls itself and establishes for itself a realm in the clouds can only be explained from the heterogeneity and self-contradiction of the material foundation. This itself must first become understood in its contradictions and so become thoroughly revolutionized by the elimination of the contradiction. After the earthly family has been discovered as the secret of the Holy Family, one must have theoretically criticised and theoretically revolutionised it beforehand.
V.
Feuerbach, not satisfied with abstract thought, invokes impressions produced by the senses, but does not comprehend sensation as practical sensory activities.