"The absolute condition for friendship is unity in a life-view. If a person has that, he will not be tempted to base his friendship on obscure feelings or on indefinable sympathies. As a consequence, he will not experience these ridiculous shifts, so that one day he has a friend and the next day he does not. He will not fail to appreciate the significance of the indefinable sympathies, because, strictly speaking, a person is certainly not a friend of everyone with whom he shares a life-view but neither does he stop with only the mysteriousness of the sympathies. A true friendship always requires consciousness and is therefore freed from being infatuation. The life-view in which one is united must be a positive view."
January 1, 1970
https://en.wikiquote.org/wiki/Friendship