10.35.54   To this is added another form of temptation more manifoldly dangerous. For besides that concupiscence of the flesh which consisteth in the delight of all senses and pleasures, wherein its slaves, who go far from Thee, waste and perish, the soul hath, through the same senses of the body, a certain vain and curious desire, veiled under the title of knowledge and learning, not of delighting in the flesh, but of making experiments through the flesh. The seat whereof being in the appetite of knowledge, and sight being the sense chiefly used for attaining knowledge, it is in Divine language called The lust of the eyes. For, to see, belongeth properly to the eyes; yet we use this word of the other senses also, when we employ them in seeking knowledge. For we do not say, hark how it flashes, or smell how it glows, or taste how it shines, or feel how it gleams; for all these are said to be seen. And yet we say not only, see how it shineth, which the eyes alone can perceive; but also, see how it soundeth, see how it smelleth, see how it tasteth, see how hard it is. And so the general experience of the senses, as was said, is called The lust of the eyes, because the office of seeing, wherein the eyes hold the prerogative, the other senses by way of similitude take to themselves, when they make search after any knowledge.