I.
The chief lack of all materialistic philosophy up to the present, including that of Feuerbach, is that the thing, the reality, sensation is only conceived of under the form of the object which is presented to the eye, but not as human sense-activity, "praxis," not subjectively. It therefore came about that the active side in opposition to materialism was developed from idealism, but only abstractly; this was natural, since idealism does not recognize real tangible facts as such. Feuerbach is willing, it is true, to distinguish objects of sensation from objects existing in thought, but he conceives of human activity itself not as objective activity. He, therefore, in the "Wesen des Christenthums," regards only theoretical activity as generally human, while the "praxis" is conceived and fixed only in its disgusting form.