No man puts a piece of new cloth onto an old garment, for that which is put on to fill it up takes from the garment, and the tear is made worse.
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Then what He had done before, this He does here again. I mean, that as He, when they were attempting to prove Him blameable for eating with sinners, proved to them on the contrary, that His proceeding was not only no blame, but an absolute praise to Him: so here too, when they wanted to show of Him, that He knows not how to manage His disciples, He signifies that such language was the part of men not knowing how to manage their inferences, but finding fault at random.
For no man, says He, puts a piece of new cloth unto an old garment.
He is again establishing His argument by illustrations from common life. And what He says is like this, The disciples have not yet become strong, but still need much condescension. They have not yet been renewed by the Spirit, and on persons in that state one ought not to lay any burden of injunctions.
And these things He said, setting laws and rules for His own disciples, that when they should have to receive as disciples those of all sorts that should come from the whole world, they might deal with them very gently.