Feuerbach's idealism consists in this, that he does not simply take for granted the mutual and reciprocal feelings of men for one another such as sexual love, friendship, compassion, self-sacrifice, etc., but declares that they would come to their full realization for the first time as soon as they were consecrated under the name of religion. The main fact for him is not that these purely human relations exist, but that they will be conceived of as the new true religion. They will be fully realized for the first time if they are stamped as religions. Religion is derived from "religare" and means originally "fastening." Therefore, every bond between men is religion. Such etymological artifices are the last resort of the idealistic philosophy. Not what the word means according to the historical development of its true significance, but what it should mean according to its derivation is what counts, and so sex-love and the intercourse between the sexes is consecrated as a "religion" only so that the word religion, which is dear to the mind of the idealist, shall not vanish from the language. The Parisian reformer of the stripe of Louis Blanc used to speak just in the same way in the forties, for they could only conceive of a man without religion as a monster, and used to say to us "Atheism, then, is your religion." If Feuerbach wants to place true religion upon the basis of real materialistic philosophy, that would be just the same as conceiving of modern chemistry as true alchemy. If religion can exist without its God then alchemy can exist without its philosopher's stone. There exists, by the way, a very close connection between alchemy and religion. The philosopher's stone has many properties of the old gods, and the Egyptian-Greek alchemists of the first two centuries of our era have had their hands in the development of Christian doctrines, as Kopp and Berthelot prove.