<p>2:14 <i>But when I saw that they did not walk straightly according to the truth of the gospel</i>- Gk. 'with straight feet', like the cherubim. Correct walk / behaviour is therefore related to the fact we have believed the <i>true</i> Gospel, i.e. we hold the right Gospel rather than the wrong one. The true Gospel was simple- believe in the Lord's death and resurrection and the salvation in Him, identify with it in baptism, and indeed it shall be true for us. In this lies the importance of doctrine. This is why Is. 29:13,24 speaks of repentance as 'learning doctrine'; Israel went astray morally because they allowed themselves to be taught wrong doctrine.</p><p><i>I said to Cephas before all: If you, being a Jew, live as do the Gentiles, and not as do the Jews, why do you compel the Gentiles to live as do the Jews?</i>- Paul uses Peter's old name because he feels Peter has slipped back to his old positions and is at this time not living according to the Lord's hope and expectation of him, which was that he would be a rock, Peter, the rocky one.</p>