Tertullian

“ Now if the soul is by nature associated with the mind, it is impossible to draw the conclusion that the mind is impassible; or again, if the soul suffers not either by the mind or with the mind, it cannot possibly have a natural association with the mind, with which it suffers nothing, and which suffers nothing itself. Moreover, if the soul suffers nothing by the mind and with the mind, it will experience no sensation, nor will it acquire any knowledge, nor will it undergo any emotion through the agency of the mind, as they maintain it will. ”

“ For, having imagined the mind to be the initiating principle of all things, and suspending on its axis the balance of the universe; affirming, moreover, that the mind is a simple principle, unmixed, and incapable of admixture, he mainly on this very consideration separates it from all amalgamation with the soul ”

“ Besides, if a separate condition between the soul and mind is to be admitted, so that they be two things in substance, then of one of them, emotion and sensation, and every sort of taste, and all action and motion, will be the characteristics; whilst of the other the natural condition will be calm, and repose, and stupor. There is therefore no alternative: either the mind must be useless and void, or the soul. ”