The reason why this is continuously undergoing changes in keeping with the changes in the state of a person's life is that nothing exists unless it has a form, and it is its state that creates its form. It is therefore the same whether we say that the state of a person's life changes or his form changes. All of a person's affections and thoughts are in forms and thus come from forms, since forms are their realisations; if affections and thoughts could exist without being realised, they might even exist in skulls devoid of brains. This would be much the same as seeing without an eye, or hearing without an ear, or tasting without a tongue; these organs are the means by which these senses are realised and these are their forms, as is well known.

[2] The reason why states of life are continually changing, as is the form they take in a person, is that it is a truth taught in the past and up to the present by wise men, that it is impossible for two things, much less more than two, to be absolutely identical. Thus for instance no two persons-much less more than two-have the same face. The same is true in successive series; no state of life is exactly the same as that which preceded it. From this the conclusion follows that a person's state of life is perpetually changing, and so as a result is his form, especially that of his inner regions. However, since these matters do not teach us anything about marriage, but only prepare the way for knowledge of the subject, and because they are merely philosophical investigations based on the intellect and some people may find them difficult to grasp, I shall pass on after these few remarks.