Oh, foolish Galatians! What magician has cast an evil spell on you? For you used to see the meaning of Jesus Christ's death as clearly as though I had shown you a signboard with a picture of Christ dying on the cross.
Let me ask you this one question: Did you receive the Holy Spirit by keeping the law? Of course not, for the Holy Spirit came upon you only after you believed the message you heard about Christ.
Have you lost your senses? After starting your Christian lives in the Spirit, why are you now trying to become perfect by your own human effort?
You have suffered so much for the Good News. Surely it was not in vain, was it? Are you now going to just throw it all away?
I ask you again, does God give you the Holy Spirit and work miracles among you because you obey the law of Moses? Of course not! It is because you believe the message you heard about Christ.
In the same way, "Abraham believed God, so God declared him righteous because of his faith."
References for Galatians 3:6