39. I see that my argument in this book respecting the Holy Spirit, according to the Holy Scripture, is quite enough for faithful men who know already that the Holy Spirit is God, and not of another substance, nor less than the Father and the Son,—as we have shown to be true in the former books, according to the same Scriptures. We have reasoned also from the creature which God made, and, as far as we could, have warned those who demand a reason on such subjects to behold and understand His invisible things, so far as they could, by those things which are made and especially by the rational or intellectual creature which is made after the image of God; through which glass, so to say, they might discern as far as they could, if they could, the Trinity which is God, in our own memory, understanding, will. Which three things, if any one intelligently regards as by nature divinely appointed in his own mind, and remembers by memory, contemplates by understanding, embraces by love, how great a thing that is in the mind, whereby even the eternal and unchangeable nature can be recollected, beheld, desired, doubtless that man finds an image of that highest Trinity. And he ought to refer the whole of his life to the remembering, seeing, loving that highest Trinity, in order that he may recollect, contemplate, be delighted by it. But I have warned him, so far as seemed sufficient, that he must not so compare this image thus wrought by that Trinity, and by his own fault changed for the worse, to that same Trinity as to think it in all points like to it, but rather that he should discern in that likeness, of whatever sort it be, a great unlikeness also.