The bad results of a different gospel

In Galatians 1:7 Paul describes the negative effect the preaching of his opponents had on the Galatians. This is part of the substructure of his argument against them: His opponents’ gospel is negative because of its end result. He describes what they are doing to the Galatians with the verb ταράσσω (tarassō), which literally means “to shake, stir”; applied to individuals it takes on the figurative meaning of “stir up, disturb, unsettle.” The joyous confirmation in Christ the Galatians had experienced by believing in Paul’s gospel had been unsettled by these opponents. This was enough in Paul's mind to mark their gospel as heterodox.