a love of use, thus not for the sake of self, but for the sake of the neighbor; and because this love is given only by the Lord out of heaven, and is given by the Lord when man flees from evils as sins, therefore it is that love or the will can be elevated by these means, and cannot without these means.  But love or the will is elevated into heaven’s heat, while the understanding is elevated into its light.  When both are elevated, a marriage of the two takes place there, which is called celestial marriage, because it is a marriage of celestial love and wisdom; consequently it is said that love also is elevated if it loves wisdom, its consort, in that degree.  The love of wisdom, that is, the genuine love of the human understanding is love towards the neighbor from the Lord.  It is the same with light and heat in the world.  Light exists without heat and with heat; light is without heat in winter time, and with heat in summer time; and when heat is with light all things flourish.  The light with man that corresponds to the light of winter is wisdom without its love; and the light with man that corresponds to the light of summer is wisdom with its love.

415.  This conjunction and disjunction of wisdom and love can be seen effigied, as it were, in the conjunction of the lungs with the heart.  For the heart can be conjoined to the clustering vesicles of the bronchia by blood sent out from itself, and also by blood sent out not from itself but from the vena cava and the aorta.  Thereby the respiration of the body can be separated from the respiration of the spirit; but when blood from the heart alone acts the respirations cannot be separated.  Now since thoughts act as one with respirations by correspondence it is plain, from the twofold state of the lungs in respirations, that man is able to think and from thoughts to speak and act in one way when in company with others, and to think and from thought to speak and act in another way when not in company, that is, when he has no fear of loss of reputation; for he can then think and speak against God, the neighbor, the spiritual things of the church, and against moral and civil laws; and he can also act contrary to them, by stealing, by being revengeful, by blaspheming, by committing adultery.  But in company with others, where he is afraid of losing reputation, he can talk, preach and act precisely like a spiritual, moral and civil man.  From all this it can be seen that love or the will as well as the understanding can be elevated and can receive such things as are of the heat or love of heaven, provided it loves wisdom in that degree, and if it does not love wisdom, that it can as it were be separated.