Confused?
Gal 5:10 I am confident in the Lord that you will take no other view. The one who is throwing you into confusion will pay the penalty, whoever he may be.
It's a bit of a paradox here. Previously Paul expressed doubt saying, for example, "how I wish I could be with you now and change my tone, because I am perplexed about you!" Gal 4:20 Or "I fear for you, that somehow I have wasted my efforts on you." Gal 4:11 But I think he means is "In light of what I've written, I am confident in the Lord that you will take no other view."
The elect often reveal themselves by the way they respond to correction. It's inevitable that those who are Jesus' will follow Him. "My sheep hear My voice, and I know them, and they follow Me." John 10:27, along with the voice of his apostles, "We are from God, and whoever knows God listens to us." 1John 4:6 We need correction to maintain a proper walk, but we must also beware of false shepherds who would falsely "correct" us off the right path.
Paul shows little sympathy for false teachers here, and such is generally the case throughout the New Testament.