Taboo
"Taboos, we must suppose, are prohibitions of primæval antiquity which were at some time externally imposed upon a generation of primitive men; they must, that is to say, no doubt have been impressed on them violently by the previous generation. These prohibitions must have concerned activities towards which there was a strong inclination. They must then have persisted from generation to generation, perhaps merely as a result of tradition transmitted through parental and social authority."