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
that is, not even the fact that hardly you have taken him, and with endless toils, induces you to be sparing towards him, although of the things we have hardly acquired, we are more sparing, but you not even this renders more gentle.
Here He lays to their charge two things; one, that they are unprofitable for the salvation of the many, and need much toil in order to win over even one; another, that they were remiss in the preservation of him whom they had gained, or rather that they were not only careless, but even traitors, by their wickedness in their life corrupting him, and making him worse. For when the disciple sees his teachers to be such as these, he becomes worse than they. For he stops not at his teacher's wickedness; but as when his teacher is virtuous, he imitates him, so when he is bad, he even goes beyond him, by reason of our proneness to what is evil.
And He calls him a child of hell, that is, a very hell. And He said twofold more than you, that He might both alarm those, and make these feel the more severely, because they are teachers of wickedness. And not this only, but because they labor to instill into their disciples a greater wickedness, hardening them to a much greater depravity than they have, and this is above all a mark of a depraved soul.
Then He derides them for folly also, because they bade them disregard the greater commandments. And yet before He had said the opposite, that they bind heavy burdens, and grievous to be borne. But these things too they did again and were doing everything for the corruption of those who were subject to them, in little things requiring strictness, and despising the great.