[172] And it is better to understand these things thus: every beginning and every end is spontaneous, that is to say, it is the work of nature and not of ourselves. For instance; what is the beginning of learning. It is plain that it is a nature in the person who is taught which is well calculated to receive the particular subjects of meditation submitted to him. Again what is the beginning of being made perfect? If we are to speak plainly without keeping anything back, it is nature. Therefore he who teaches is also indeed to effect improvement, but it is God alone, the most excellent nature of all, who is able to conduct one to supreme perfection.