409. (xi) Love or the will does nothing except in conjunction with wisdom or the understanding. For as love has no sensate nor any active life apart from the understanding, and as love introduces the understanding into all things of the mind (as was shown above, n. 407, 408), it follows that love or the will does nothing except in conjunction with the understanding. For what is it to act from love without the understanding? This can only be called irrational; for the understanding teaches what ought to be done and how it ought to be done. Love does not know this apart from the understanding; consequently the marriage between love and the understanding is such that although they are two, yet they act as one. There is a similar marriage between goodness and truth, for goodness is of love, and truth is of the understanding. Every single thing in the universe which has been created by the Lord has such a marriage; their use has relation to goodness and the form of the use to truth. It is from this marriage that in each and everything of the body there is a right and a left, and the right relates to goodness from which truth springs, and the left to truth from goodness, thus to their conjunction. The pairs in man are from this source. There are two brains, two hemispheres of the brain, two ventricles of the heart, two lobes of the lungs, two eyes, ears, nostrils, arms, hands, loins, feet, kidneys, testicles, and other things; and where there are not pairs, there is a right and a left. There are pairs because goodness has truth in view in order that it may have existence, and truth has goodness in view in order that it may itself have being. It is the same in the angelic heavens and in each of their societies. More concerning these may seem above (n. 401), where it was shown that love or the will can do nothing through its human form without a marriage with wisdom or the understanding. The conjunction of evil and falsity, which is the opposite of the conjunction of good and truth, will be spoken of elsewhere.