All men are not born equal.

Everyone agrees about that now, but nevertheless the momentum of the earlier movement was so powerful that we still go on acting as though all men are, and always will be, born equal, and that we need not trouble ourselves about heredity but only about the environment.
[21] But this statement must not be left without important qualification.

Thus the ancient Greeks (as Moissides has shown in _Janus_, 1913), not only their philosophers and statesmen, but also their women, often took the most enlightened interest in eugenics, and, moreover, showed it in practice.

They were in many respects far in advance of us.

They clearly realised, for instance, the need of a proper interval between conceptions, not only to ensure the health of women, but also the vigour of the offspring.