Woe unto you, scribes and Pharisees, hypocrites! for you travel on sea and land to make one proselyte, and when he is made, you make him twofold more the child of hell than yourselves.
All Commentaries on Matthew 23:15 Go To Matthew 23
John Chrysostom
AD 407
This the next charge against them is, that they are unequal to the salvation of many, seeing they need so much labour to bring one to salvation; and not only are they slack in conversion, but destroy even those whom they do convert, by corrupting them by example of evil life.
Or, because while he was a worshipper of idols, he observed righteousness even because of men; but when he became a Jew, prompted by the example of evil teachers, he became worse than his teachers.
For a disciple imitates a virtuous master, but goes beyond a vicious one.