[46] "Dwell, therefore," says she, "O my child, with him," not all thy life, but "certain days;" that is to say, learn to be acquainted with the country of the external senses; know thyself and thy own parts, and what each is, and for what end it was made, and how it is by nature calculated to energise, and who it is who moves those marvellous things, and pulls the strings, being himself invisible, in an invisible manner, whether it is the mind that is in thee, or the mind of the universe.