Love is but a prelude to life, an overture in which the theme of the impending work is exquisitely hinted at, but which remains nevertheless only a symbol and a promise. What is to follow, if all goes well, begins presently to appear. Passion settles down into possession, courtship into partnership, pleasure into habit. A child, half mystery and half plaything, comes to show us what we have done and to make its consequences perpetual. We see that by indulging our inclinations we have woven about us a net from which we cannot escape: our choices, bearing fruit, begin to manifest our destiny. That life which once seemed to spread out infinitely before us is narrowed to one mortal career. We learn that in morals the infinite is a chimera, and that in accomplishing anything definite a man renounces everything else. He sails henceforth for one point of the compass. [Sidenote: It harmonises natural interests.] The family is one of nature’s masterpieces. It would be hard to conceive a system of instincts more nicely adjusted, where the constituents should represent or support one another better. The husband has an interest in protecting the wife, she in serving the husband. The weaker gains in authority and safety, the wilder and more unconcerned finds a help-mate at home to take thought for his daily necessities. Parents lend children their experience and a vicarious memory; children endow their parents with a vicarious immortality. [Sidenote: Capacity to be educated goes with immaturity at birth.] The long childhood in the human race has made it possible and needful to transmit acquired experience: possible, because the child’s brain, being immature, allows instincts and habits to be formed after birth, under the influence of that very environment in which they are to operate; and also needful, since children are long incapable of providing for themselves and compel their parents, if the race is not to die out, to continue their care, and to diversify it. To be born half-made is an immense advantage. Structure performed is formed blindly; the _a priori_ is as dangerous in life as in philosophy. Only the cruel workings of compulsion and extermination keep what is spontaneous in any creature harmonious with the world it is called upon to live in. Nothing but casual variations could permanently improve such a creature; and casual variations will seldom improve it. But if experience can co-operate in forming instincts, and if human nature can be partly a work of art, mastery can be carried quickly to much greater lengths. This is the secret of man’s pre-eminence. His liquid brain is unfit for years to control action advantageously. He has an age of play which is his apprenticeship; and he is formed unawares by a series of selective experiments, of curious gropings, while he is still under tutelage and suffers little by his mistakes. [Sidenote: The naturally dull achieve intelligence.]