66. The same conclusions can obviously be drawn from the fact that human beings were created to fulfil that love, and from their subsequent development under its influence. The male was created to become wisdom as the result of the love of being wise, and woman was created to become the love of the male as the result of and in proportion to his wisdom. Hence it is plain that a married couple are really forms and images of the marriage of love and wisdom, that is, of good and truth. It must be appreciated that neither good nor truth can exist unless embodied in substance, as its own realisation. Abstract kinds of good and truth cannot exist, for lacking a position there is nowhere they can be; nor can they even appear transiently like flying creatures. They are therefore mere entities, about which it appears possible for reason to think in abstract, yet it is impossible unless they are embodied in realisations. For any idea a person forms, however lofty, is substantial, that is, attached to substances. In addition it needs to be known that no substance can exist without being a form. Nor is there such a thing as an unformed substance, since nothing can be predicated of it, and a subject without predicated qualities is also an irrational entity. These philosophical considerations are added to make it possible to see that a married couple, who live in truly conjugial love, really are forms of the marriage of good and truth, or love and wisdom.