And one may remark, that because of this the lawgiver allows just so much time, as it may be remaining within one, but when it is gone forth, no longer. For instance, at evening He bids you wash yourself, and so be clean; measuring the time of the digestion, and of the excretion. But the things of the heart, He saith, abide within, and when they are gone forth they defile, and not when abiding only. And first He puts our evil thoughts, a kind of thing which belonged to the Jews; and not as yet doth He make His refutation from the nature of the things, but from the manner of production from the belly and the heart respectively, and from the fact that the one sort remains, the other not; the one entering in from without, and departing again outwards, while the others are bredwithin, and having gone forth they defile, and then more so, when they are gone forth. Because they were not yet able, as I said, to be taught these things with all due strictness.