Bonellus* saith: Know, all ye disciples, that out of the elect things nothing becomes useful without conjunction and regimen,* because sperma is generated out of blood and desire. For the man mingling with the woman, the sperm is nourished by the humour of the womb, and by the moistening blood, and by heat, and when forty nights have elapsed the sperm is formed. But if the humidity of the blood and of the womb were not heat, the sperm would not be dissolved, nor the foetus be procreated. But God has constituted that heat and blood for the nourishment of the sperm until the foetus is brought forth, after which it is not nourished, save by milk and fire, sparingly and gradually, while it is dust, and the more it burns the more, the bones being strengthened, it is led towards youth, arriving at which it is independent.t Thus it behoves you also to act in this Art. Know ye that without heat nothing is ever generated, and that the bath causes the matter to perish by means of intense heat. If, indeed, it be frigid, it puts to flight and disperses, but if it have been tempered, it is convenient and sweet to the body, wherefore the veins become smooth and the flesh is augmented. Behold it has been demonstrated to you, all ye disciples! Understand, therefore, and in all things which ye attempt to rule, fear God.