William Burkitt on Matthew 18:8

This command of Christ is not to be understood literally, as if it were our duty to maim our bodily members; but the exhortation is to cut off all occasions that may betray us into sin; and to mortify our darling and beloved lust, though as dear to us as our right eye.

Learn, 1. That sin may be avoided. It is our duty to avoid whatever leads unto it, or may be the instrument or occasion of it.

2. That the best way to be kept from the outward acts of sin, is to mortify our inward affection and love to sin. If our love and affection to sin be mortified, our bodily members may be preserved, for they will no longer be weapons of sin, but instruments of holiness.