Many leading doctors of the schools moreover declare that the passion is innate, and _therefore passes on with the seed to descendants_, not indeed hereby incriminating nature, which teaches men the bounds of its purity by the example of other animals (for animals are called by wise men nature’s mirrors), but rather the human race that retains so obstinately vices once adopted, that by no renewal can it be purified, and has left no room for change. Similarly a _mental_ depravity grows graver as men advance in life, whereas most affections of the _body_, whether innate or adventitious, get weaker as men get older, for instance gout, epilepsy and madness, and so as age advances undoubtedly grow milder. For all troublesome factors will produce strong effects in proportion to the firmness to resist possessed by the affected parts, and as this firmness is deficient in old men, so the complaint or passion diminishes in intensity, as does the general strength. _But_ that passion which makes men subservient or effeminate, grows stronger and more serious as the body grows old and stirs the sufferers with yet more abominable lustfulness,—and not without a reason. For at other ages, the body being still strong and capable of performing the natural offices of love, there is no division of lust into double forms of wantonness, through their mind being tossed to and fro now by passive now by active lewdness. But in such as have failed from age, and become incapable of the manly office of love, all the wantonness of the mind is directed on the appetite for the opposite form of gratification; and for this cause a woman demands love more strongly than a man. In fact many conjecture it is for this reason that boys also are tormented by this passion. For they resemble old men in lacking power for the virile function. It is not yet born in boys; old men have lost it.)