Gregory the Great
c. A.D. 540–604
“For what portion would God have in me from above, and what inheritance would the Almighty have from on high? As though he said in plain words; 'If I defile, my mind in thought, I can never be the 'inheritance' of Him, Who is the Author of purity.' For the rest are no good things at all, if to the eyes of the secret Judge they be not approved by the testimony of chastity. For all the virtues lift themselves up in the sight of the Creator by reciprocal aid, that because one virtue without another is either none at all or the very least one, they should be mutually supported by their alliance together. For if either humility forsake chastity, or chastity abandon humility, before the Author of humility and chastity, what does either a proud chastity, or a polluted humility avail to benefit us? And so that the holy man might obtain to be owned by his Maker in the remaining particulars of good, keeping purity of the heart, let him say, I made a covenant with mine eyes, that I should not even think on a maid. For what portion would God have in me from above, and what inheritance would the Almighty have from on high? As though he made the confession in plain words, saying, The Creator of the things on high refuses to own me for his possession, if in His sight my mind rots in the lowest desires. But herein it should be known that that is one thing which the mind meets with from the tempting of the flesh, and another thing, when by consent it is tied and bound with gratifications. For very often it is struck by wrong thinking and resists, but very often when it conceives any thing wrong, it revolves this within itself even in the way of desire. And certainly impure thought never in the least defiles the mind when it strikes it, but when it subdues the same to itself by the taking delight. Thus it is hence the great Preacher says, There hath no temptation taken you but such as is common to man. For that is 'temptation common to man,' by which we are very often reached in the thought of the heart even against our will, because this, viz. that even things forbidden sometimes occur to the mind, this assuredly we have in our own selves derived from the burthen of human nature as subject to corruption. But henceforth it is devilish and not 'human' temptation, when to that which the corruptibility of the flesh prompts, the mind attaches itself by the consent. Hence again he says, Let not sin reign in your mortal body. For he forbad not that sin should 'be' in our mortal body, but that it should 'reign in our mortal body.' Because in flesh subject to corruption it may not 'reign,' but cannot help but 'be.' For this very thing to be tempted touching sin, is sin to it, which same because so long as we live, we are not perfectly and altogether without, holy preaching seeing that it could not wholly banish the same, took away from it its 'reign' from the dwelling-place of our heart, that the unlawful longing, though it very often secretly insinuate itself as a thief in our good thoughts, at all events should not, if it should even win an entrance, exercise dominion. Accordingly the holy man in saying, I made a covenant with mine eyes, that I should not even think upon a maid, would not at all be understood, that sin did not touch his mind in thought, but that it never mastered him by the consent. For he defends his soul as the most entire possession of God against the adversary's making a prey of it, who directly subjoins, For what portion would God have in me from above, or what inheritance would the Almighty have from on high? As though he said in plain words; 'In my mortal flesh indeed I am subject to the constitution of corruption; but wherein do I serve the Maker, if to Him I do not defend my mind whole and entire from the consent to sin?...”