The woman's knowledge on that subject can be far more conclusive than the man's as the mother of Don Juan stridently declared. A man will not work hard to pass wealth to children whom he suspects or knows are another's. Men will not scrimp and save and slave except for themselves, their individually possessed wives, and their own children. Selfish, of course, but human nature. In fact, nobody except consistent socialists dare attack this obvious and flagrant but meritorious selfishness.
Women are no better.
Women are much more protective of their children than of their men. No woman is happy that the children of a husband's mistress inherit equally with her own. Obviously, this is selfishness, too, but is inescapable human nature. In other words, morality in all its aspects is inextricably tied up with selfishness . Selfishness is a power for good in society and for the maintenance of order and of prosperity.