Such attachments have been always affairs of the heart, even between man and man.

I do not think you can name an instance of a lasting friendship on a purely intellectual basis.

True friendship implies the absence of envy, and the vanity of even the meanest intellect is far too great to admit of such a condition out of pure thought-sympathy." "I do not see any contradiction, even admitting your last remark, which is cynical enough." Margaret spoke indifferently, as making a mere criticism.
"But I believe most people connect the idea of friendship, beyond ordinary liking, with intellectual sympathy.

They suppose, for instance, that a man may love a woman wholly and entirely with the best kind of love, and may have at the same time a friend with whom he is in entire sympathy." "And why not ?" she asked.
"Simply because he cannot serve two masters.

If he is in entire sympathy with more than one individual he must sometimes not only contradict himself, as he would rightly do for one or the other alone, but he must also contradict one in favour of the other in case they disagree.