That is the Mongolian creation myth: out of two different natures love is born. In contradiction, love grows in strength. In confrontation and transformation, love is preserved.
Therefore once for all this short command is given to you. 'Love and do what you will.' If you keep silent, keep silent by love; if you speak, speak by love; if you correct, correct by love; if you pardon, pardon by love: let love be rooted in you, and from the root nothing but good can grow.
The mind which is created quick to love, is responsive to everything that is pleasing, soon as by pleasure it is awakened into activity. Your apprehensive faculty draws an impression from a real object, and unfolds it within you, so that it makes the mind turn thereto. And if, being turned, it inclines towards it, that inclination is love; that is nature, which through pleasure is bound anew within you.
Love between man and man is impossible because there must not be sexual intercourse and friendship between man and woman is impossible because there must be sexual intercourse.
Oh, love is very much a physical thing.... I realize that it's very complicated, and I'm sure it can't be traced to individual neurons and hormones, but I think it's very much a physiological sensation that takes place in the brain.
Desire itself is movement
Not in itself desirable;
Love is itself unmoving,
Only the cause and end of movement,
Timeless, and undesiring
Except in the aspect of time
Caught in the form of limitation
Between un-being and being.
And so when the essential idea of love is lost there comes talk of fidelity. Actually, the only possible basis for two beings, male and female, to relate to each other is to grant each other total freedom.