Desiring to be teachers of the law. — “Desiring,” though they really were not. They coveted the respect and influence which was ever paid to the acknowledged teachers of the Law of Moses; but these men utterly failed to understand the real spiritual meaning of that Law which they pretended to teach. Similar pretenders in a neighbouring Church, some years later, received from another Apostle — St. John — a stern rebuke for such pretensions. “I know,” wrote St. John to the Christians of Smyrna, “the blasphemy of them which say they are Jews, and are not, but are the synagogue of Satan” (Revelation 2:9).
Understanding neither what they say, nor whereof they affirm. — A wise teacher must understand what he teaches, and must, at the same time, be clear in his own mind that what he teaches is true.
The false teachers are here charged (1) with not understanding the wild fables and traditions upon which their teaching was based, and (2) with not comprehending the things whereof they make their assertions: that is, they had no real belief in those great truths which really underlie that Law with which they were meddling.