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Man's new sense of pity began to interfere with the ruthless workings of nature. The only method compatible with our notions of civilization and the race is to prevent the breeding of the unfit by sterilization and the deliberate guidance of the mating instinct. The trend of opinion among eugenists is that we must make marriage more difficult. Certainly no one who is not a desirable parent should be permitted to produce progeny. A century from now it will no more occur to a normal person to mate with a person eugenically unfit than to marry a habitual criminal.
There are so many disciplines in being a parent besides the obvious ones like getting up in the night and putting up with the noise in the day. And almost the hardest of all is learning to be a well of affection and not a fountain, to show them we love them, not when we feel like it, but when they do.