John Chrysostom
The eye of flesh is the mirror of the inward eye. The body also has its own sense, that is, the left eye, and its own appetite, that is, the left hand. But the parts of the soul are called right, for the soul was created both with free-will and under the law of righteousness, that it might both see and do rightly. But the members of the body being not with free-will, but under the law of sin, are called the left. Yet He does not bid us cut off the sense or appetite of the flesh; we may retain the desires of the flesh, and yet not do thereafter, but we cannot cut off the having the desires. But when we wilfully purpose and think of evil, then our right desires and right will offend us, and therefore He bids us cut them off. And these we can cut off, because our will is free.
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Or otherwise; Every thing, however good in itself that offends ourselves or others, we ought to cut off from us. For example, to visit a woman with religious purposes, this good intent towards her may be called a right eye, but if often visiting her I have fallen into the net of desire, or if any looking on are offended, then the right eye, that is, something in itself good, offends me. For the right eye is good intention, the right hand is good desire.
But if according to that of the Prophet, there is no whole part in our body, (Ps. 38:3.) it is needful that we cut off every limb that we have that the punishment may be equal to the depravity of the flesh. Is it then possible to understand this of the bodily eye or hand? As the whole man when he is turned to God is dead to sin, so likewise the eye when it has ceased to look evil is cut off from sin. But this explanation will not suit the whole; for when He says, thy right eye offends thee, what does the left eye? Does it contradict the right eye, and it is preserved innocent?
Otherwise; Christ would have us careful not only of our own sin, but likewise that even they who pertain to us should keep themselves from evil. Have you any friend who looks to your matters as your own eye, or manages them as your own hand, if you know of any scandalous or base action that he has done, cast him from you, he is an offence; for we shall give account not only of our own sins, but also of such of those of our neighbours as it is in our power to hinder.
For as we are every one members one of another, it is better that we should be saved without some one of these members, than that we perish together with them. Or, it is better that we should be saved without one good purpose, or one good work, than that while we seek to perform all good works we perish together with all.