Peter Martyr Vermigli:

Further also, seeing by the mercy of God, through the death of Christ, we are so steadfastly placed; we must take heed, that through wicked and shameful acts, we throw not ourselves down headlong from thence. For they, which after they have been once reconciled, persist in defiling themselves with vices, do not only fall headlong from their most excellent state and condition; but also (as it is written unto the Hebrews) do tread under foot the Son of God (Heb. 10:29), and pollute his blood, which was shed for them. By this place also we are taught to love our enemies, not after that ordinary manner; as when men are wont to say, that it is enough to wish well unto their enemy, they will put no endeavor, either to amend him, or to bring him to salvation. And that, which is more grievous, they not only are not beneficial towards their enemies; but also through their slothfulness, they suffer the weak brethren to perish. They wink at their faults, neither do they use their admonitions and reprehensions to amend them.

Peter Martyr, The Common Places, trans., and compiled by Anthonie Martin, 1583, part 2, p., 611.