I am astonished and extremely irritated that you are so quickly shifting your allegiance and deserting Him who called you by the grace of Christ, for a different [even contrary] gospel;

But when God, who had chosen me and set me apart before I was born, and called me through His grace, was pleased

This [deceptive] persuasion is not from Him who called you [to freedom in Christ].

For you, my brothers, were called to freedom; only do not let your freedom become an opportunity for the sinful nature (worldliness, selfishness), but through love serve and seek the best for one another.