And lastly, love. I am using this celebrated word in its widest and dullest sense. Let me be very dry and brief about sex in the first place. Some years after a human being is born, certain changes occur in it, as in other animals, which changes often lead to union with another human being, and to the production of more human beings. And our race goes on. Sex begins before adolescence, and survives sterility; it is indeed coeval with our lives, although at the mating age its effects are more obvious to society. And besides sex, there are other emotions, also strengthening towards maturity: the various upliftings of the spirit, such as affection, friendship, patriotism, mysticism--and as soon as we try to determine the relation between sex and these other emotions we shall of course begin to quarrel as violently as we ever could about Walter Scott, perhaps even more violently. Let me only tabulate the various points of view. Some people say that sex is basic and underlies all these other loves--love of friends, of God, of country. Others say that it is connected with them, but laterally, it is not their root. Others say that it is not connected at all. All I suggest is that we call the whole bundle of emotions love, and regard them as the fifth great experience through which human beings have to pass. When human beings love they try to get something. They also try to give something, and this double aim makes love more complicated than food or sleep. It is selfish and altruistic at the same time, and no amount of specialization in one direction quite atrophies the other. How much time does love take? This question sounds gross but it must be asked because it bears on our present enquiry. Sleep takes about eight hours out of the twenty-four, food about two more. Shall we put down love for another two? Surely that is a handsome allowance. Love may weave itself into our other activities--so may drowsiness and hunger. Love may start various secondary activities: for instance, a man's love for his family may cause him to spend a good deal of time on the Stock Exchange, or his love for God a good deal of time in church. But that he has emotional communion with any beloved object for more than two hours a day may be gravely doubted, and it is this emotional communion, this desire to give and to get, this mixture of generosity and expectation, that distinguishes love from the other experiences on our list.