[This letter is from] Paul, an apostle, (not from [the authority of] men, or through the [agency] of a man, but by [a direct commission from] Jesus Christ and God the Father, who raised Him from the dead).
I am astonished that you people are so quickly abandoning God [i.e., by rejecting His truth], who called you [to Himself] through the unearned favor bestowed [on us] by Christ. [You are turning] to a different “gospel,”