We may find the clue in one of the so-called ideal standards of civilized society. It runs: ‘Thou shalt love thy neighbour as thyself’. It is world-renowned, undoubtedly older than Christianity which parades it as its proudest profession, yet certainly not very old; in historical times men still knew nothing of it. We will adopt a naïve attitude towards it, as if we were meeting it for the first time. Thereupon we find ourselves unable to suppress a feeling of astonishment, as at something unnatural. Why should we do this? What good is it to us? Above all, how can we do such a thing? How could it possibly be done? My love seems to me a valuable thing that I have no right to throw away without reflection. It imposes obligations on me which I must be prepared to make sacrifices to fulfil. If I love someone, he must be worthy of it in some way or other. (I am leaving out of account now the use he may be to me, as well as his possible significance to me as a sexual object; neither of these two kinds of relationship between us come into question where the injunction to love my neighbour is concerned.) He will be worthy of it if he is so like me in important respects that I can love myself in him; worthy of it if he is so much more perfect than I that I can love my ideal of myself in him; I must love him if he is the son of my friend, since the pain my friend would feel if anything untoward happened to him would be my pain—I should have to share it. But if he is a stranger to me and cannot attract me by any value he has in himself or any significance he may have already acquired in my emotional life, it will be hard for me to love him. I shall even be doing wrong if I do, for my love is valued as a privilege by all those belonging to me; it is an injustice to them if I put a stranger on a level with them. But if I am to love him (with that kind of universal love) simply because he, too, is a denizen of the earth, like an insect or an earthworm or a grass-snake, then I fear that but a small modicum of love will fall to his lot and it would be impossible for me to give him as much as by all the laws of reason I am entitled to retain for myself. What is the point of an injunction promulgated with such solemnity, if reason does not recommend it to us?