"How is it higher ?" "It develops love," I explained.

"All the power of beautiful permanent mated love comes through this higher development." "Are you sure ?" she asked gently.

"How do you know that it was so developed?
There are some birds who love each other so that they mope and pine if separated, and never pair again if one dies, but they never mate except in the mating season.

Among your people do you find high and lasting affection appearing in proportion to this indulgence ?" It is a very awkward thing, sometimes, to have a logical mind.
Of course I knew about those monogamous birds and beasts too, that mate for life and show every sign of mutual affection, without ever having stretched the sex relationship beyond its original range.

But what of it?
"Those are lower forms of life!" I protested.