Origen
Catena Aurea · Matthäusevangelium 18
Woe unto the world because of offences! for it must needs be that offences come; but woe to that man by whom the offence cometh. Wherefore if thy hand or thy foot offend thee, cut them off, and cast them from thee: it is better for thee to enter into life halt or maimed, rather than having two hands or two feet to be cast into everlasting fire. And if thine eye offend thee, pluck it out, and cast it from thee: it is better for thee to enter into life with one eye, rather than having two eyes to be east into hell fire.
This we may understand not of the material elements of the world; but here the men who are in the world, are called the worlda. But Christ’s disciples are not of this world, whence there cannot be woe to them from offences; for though there be many offences, they do not touch him who is not of this world. But if he be yet of this world in loving the world, and the things in it, as many offences will seize him as those by which he was encompassed in the world. It follows, For it must needs be that offences come.