7.

And let it not appear to you strange, that though the mind is present in and intermingled with all those images which in the nature of things are figured or can be pictured by us, these are not evolved by the mind from within itself before it has received them through the senses from without. For we also find that, along with anger, joy, and other such emotions, we produce changes in our bodily aspect and complexion, before our thinking faculty even conceives that we have the power of producing such images [or indications of our feeling]. These follow upon the experience of the emotion in those wonderful ways (especially deserving your attentive consideration), which consist in the repeated action and reaction of hidden numbers ¹ in the soul, without the intervention of any image of illusive material things. Whence I would have you understand--perceiving as you do that so many movements of the mind go on wholly independently of the images in question--that of all the movements of the mind by which it may conceivably attain to the knowledge of bodies, every other is more likely than the process of creating forms of sensible things by unaided thought, because I do not think that it is capable of any such conceptions before it uses the body and the senses.

Wherefore, my well beloved and most amiable brother, by the friendship which unites us, and by our faith in the divine law itself, ² I would warn you never to link yourself in friendship with those shadows of the realm of darkness, and to break off without delay whatever friendship may have been begun between you and them. That resistance to the sway of the bodily senses which it is our most sacred duty to practise, is wholly abandoned if we treat with fondness and flattery the blows and wounds which the senses inflict upon us.