But this I confess unto thee, that after the way which they call heresy, so worship I the God of my fathers, believing all things which are written in the law and in the prophets: That after the way which they call heresy - See the explanation of this word in the note on Acts 5:17 (note), and see before, Acts 24:5 (note), where what is here translated heresy, is there rendered sect. At this time the word had no bad acceptation, in reference to religious opinions. The Pharisees themselves, the most respectable body among the Jews, are called a sect; for Paul, defending himself before Agrippa, says that he lived a Pharisee according to the strictest αἱρεσιν, sect, or heresy of their religion. And Josephus, who was a Pharisee, speaks, της των Φαρισαιων αἱρεσεως, of the heresy or sect of the Pharisees. Life, chap. xxxviii. Therefore it is evident that the word heresy had no bad meaning among the Jews; it meant simply a religious sect. Why then did they use it by way of degradation to St. Paul? This seems to have been the cause. They had already two accredited sects in the land, the Pharisees and Sadducees: the interests of each of these were pretty well balanced, and each had a part in the government, for the council, or Sanhedrin, was composed both of Sadducees and Pharisees: see Acts 23:6. They were afraid that the Christians, whom they called Nazarenes, should form a new sect, and divide the interests of both the preceding; and what they feared, that they charged them with; and, on this account, the Christians had both the Pharisees and the Sadducees for their enemies. They had charged Jesus Christ with plotting against the state, and endeavoring to raise seditions; and they charged his followers with the same. This they deemed a proper engine to bring a jealous government into action.
So worship I the God of my fathers - I bring in no new object of worship; no new religious creed. I believe all things as they profess to believe; and acknowledge the Law and the Prophets as divinely inspired books; and have never, in the smallest measure, detracted from the authority or authenticity of either.