[170] [cap.31] There is also a third definition of what is taught a man by himself, namely that which of its own accord rises upwards. For it is said in the hortatory injunctions, "Ye shall not sow, neither shall ye reap those things which arise from the earth of their own accord." [102] For nature has no need of any art since God himself sows those things, and by his agricultural skill brings to perfection, as if they grew of themselves, things which do not grow of themselves, except inasmuch as they stand in need of no human assistance whatever.