And that for two reasons. First, that by these words He might admonish His disciples, that as He fulfilled the Law, so they should strive to fulfil it. Secondly, because the Jews would falsely accuse them as subverting the Law, therefore he answers the calumny beforehand, but in such a manner as that He should not be thought to come simply to preach the Law as the Prophets had done.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).