21. The soul is self-governed: and though the devil can suggest, he has not the power to compel against the will. He pictures to thee the thought of fornication: if thou wilt, thou acceptest it; if thou wilt not, thou rejectest. For if thou wert a fornicator by necessity, then for what cause did God prepare hell? If thou were a doer of righteousness by nature and not by will, wherefore did God prepare crowns of ineffable glory? The sheep is gentle, but never was it crowned for its gentleness: since its gentle quality belongs to it not from choice but by nature.