What happens in spiritual marriage?

You are yet destined in that higher world to be united to the other half of yourself―to the one you failed to meet on earth who will be your loving and joyful companion, the completement of your spirit and soul―

Men and women who are truly united in the earthly sphere will not be separated in the spirit world.

All who love each other, desiring to remain together, surely will do so, but there is no law here that compels a man and woman to live together who do not wish to and who do not love each other. 

This law has nothing to do with the baser passions, nothing to do with passional attraction between the sexes, nothing to do with seething passions of any kind, nothing to do with propagation―

It is the great eternal, unchangeable law of soul mates, far, far above all earthly conditions or passions, for a man is but half a being, a woman the other half, and a soul is never complete until it is reunited to the other half of itself―until it has become absorbed once more into oneness rounded out into perfection and the only reason why this eternal oneness became separated was for the purpose of propagation, the propagation of mankind on earth that children might have a father and a mother, and when this separated soul has performed its mission on earth, it is again united into oneness in the heavens.