Transient bodies are only subject to destruction through their substance and not through their form, nor can the essence of their form be destroyed; in this respect they are permanent. The generic forms, as you know, are all permanent and stable. Form can only be destroyed accidentally, i.e., on account of its connexion with substance, the true nature of which consists in the property of never being without a disposition to receive form. This is the reason why no form remains permanently in a substance; a constant change takes place, one form is taken off and another is put on. How wonderfully wise is the simile of King Solomon, in which he compares matter to a faithless wife: for matter is never found without form, and is therefore always like such a wife who is never without a husband, never single; and yet, though being wedded, constantly seeks another man in the place of her husband: she entices and attracts him in every possible manner till he obtains from her what her husband has obtained. The same is the case with matter. Whatever form it has, it is disposed to receive another form; it never leaves off moving and casting off the form which it has in order to receive another. The same takes place when this second form is received. It is therefore clear that all corruption, destruction, or defect comes from matter. Take, e.g., man; his deformities and unnatural shape of limbs; all weakness, interruption, or disorder of his actions, whether innate or not, originate in the transient substance, not in the form. All other living beings likewise die or become ill through the substance of the body and not through its form. Man's shortcomings and sins are all due to the substance of the body and not to its form; while all his merits are exclusively due to his form. Thus the knowledge of God, the formation of ideas, the mastery of desire and passion, the distinction between that which is to be chosen and that which is to be rejected, all these man owes to his form; but eating, drinking, sexual intercourse, excessive lust, passion, and all vices, have their origin in the substance of his body. Now it was clear that this was the case,--it was impossible, according to the wisdom of God, that substance should exist without form, or any of the forms of the bodies without substance, and it was necessary that the very noble form of man, which is the image and likeness of God, as has been shown by us, should be joined to the substance of dust and darkness, the source of all defect and loss. For these reasons the Creator gave to the form of man power, rule, and dominion over the substance;--the form can subdue the substance, refuse the fulfilment of its desires, and reduce them, as far as possible, to a just and proper measure. The station of man varies according to the exercise of this power. Some persons constantly strive to choose that which is noble, and to seek perpetuation in accordance with the direction of their nobler part,--their form: their thoughts are engaged in the formation of ideas, the acquisition of true knowledge about everything, and the union with the divine intellect which flows down upon them, and which is the source of man's form. Whenever they are led by the wants of the body to that which is low and avowedly disgraceful, they are grieved at their position, they feel ashamed and confounded at their situation. They try with all their might to diminish this disgrace, and to guard against it in every possible way.