68:2.4

The herd instinct in natural man is hardly sufficient to account for the development of such a social organization as now exists on Urantia. Though this innate gregarious propensity lies at the bottom of human society, much of man’s sociability is an acquirement. Two great influences which contributed to the early association of human beings were food hunger and sex love; these instinctive urges man shares with the animal world. Two other emotions which drove human beings together and held them together were vanity and fear, more particularly ghost fear.