[170] The third law is one about the name of the Lord, not about that name which has not yet reached his creatures; for that name is unspeakable, but about the name which is constantly applied to him as displayed in his powers; for it is commanded that we shall not take his name in vain. The fourth commandment is concerning the seventh day, always virgin, and without any mother, in order that creation, taking care that it may be always free from labour, may in this way come to a recollection of him who does everything without being seen.