"Now, pure comradeship is another of those broad and yet bewildering things. We all enjoy it; yet when we come to talk about it we almost always talk nonsense, chiefly because we suppose it to be a simpler affair than it is. It is simple to conduct; but it is by no means simple to analyze. Comradeship is at the most only one half of human life; the other half is Love, a thing so different that one might fancy it had been made for another universe. And I do not mean mere sex love; any kind of concentrated passion, maternal love, or even the fiercer kinds of friendship are in their nature alien to pure comradeship."
January 1, 1970
https://en.wikiquote.org/wiki/What's_Wrong_with_the_World