Man is a social being. We live together in families, tribes and nations.
The members of a family, of a tribe, of a nation, who increase the happiness of the family, of the tribe or of the nation, are considered good members. They are praised, admired and respected. They are regarded as good; that is to say, as moral.
The members who add to the misery of the family, the tribe or the nation, are considered bad members.
They are blamed, despised, punished. They are regarded as immoral.
The family, the tribe, the nation, creates a standard of conduct, of morality. There is nothing supernatural in this.
The greatest of human beings has said, "Conscience is born of love."
The sense of obligation, of duty, was naturally produced.
Among savages, the immediate consequences of actions are taken into consideration. As people advance, the remote consequences are perceived. The standard of conduct becomes higher. The imagination is cultivated. A man puts himself in the place of another. The sense of duty becomes stronger, more imperative. Man judges himself.
He loves, and love is the commencement, the foundation of the highest virtues. He injures one that he loves. Then comes regret, repentance, sorrow, conscience. In all this there is nothing supernatural.
Man has deceived himself. Nature is a mirror in which man sees his own image, and all supernatural religions rest on the pretence that the image, which appears to be behind this mirror, has been caught.