John Chrysostom — as excerpted in the Catena Aurea on Matthew 9:14-17

“Here again He confirms what He has said by examples of common things; No man putteth a patch of undressed cloth into an old garment; for it taketh away its wholeness from, the garment, and the rent is made worse; which is to say, My disciples are not yet become strong, but have need of much consideration; they are not yet renewed by the Spirit. On men in such a state it is not behoveful to lay a burden of precepts. Herein He establishes a rule for His disciples, that they should receive with leniency disciples from out of the whole world.”