Theophylact of Ohrid
Catena Aurea · Lukasevangelium 17
Then said he unto the disciples, It is impossible but that offences will come: but woe unto him, through whom they come! It were better for him that a millstone were hanged about his neck, and he cast into the sea, than that he should offend one of these little ones.
Because the Pharisees were covetous and railed against Christ when He preached poverty, He put to them the parable of the rich man and Lazarus. Afterwards, in speaking with His disciples concerning the Pharisees, He declares them to be men who caused division, and placed obstacles in the divine way. As it follows; Then said he unto his disciples, It is impossible but that offences will come, that is, hindrances to a good life and which is pleasing to God.