Galatians 3:1-3

O you foolish and thoughtless and superficial Galatians, who has bewitched you [that you would act like this], to whom—right before your very eyes—Jesus Christ was publicly portrayed as crucified [in the gospel message]? This is all I want to ask of you: did you receive the [Holy] Spirit as the result of obeying [the requirements of] the Law, or was it the result of hearing [the message of salvation and] with faith [believing it]? Are you so foolish and senseless? Having begun [your new life by faith] with the Spirit, are you now being perfected and reaching spiritual maturity by the flesh [that is, by your own works and efforts to keep the Law]?