Christ is become of no effect unto you, whosoever of you are justified by the law; ye are fallen from grace.
Note 9 at Ga 5:4: The New American Standard Version states, "You have been severed from Christ, you who are seeking to be justified by law; you have fallen from grace" (emphasis mine). We all know how serious it is to have a body part severed, such as an arm or a foot. How much more dangerous it is to be "severed from Christ." This takes place when anyone turns from grace to the Law for salvation.
Note 10 at Ga 5:4: The expression "you are fallen from grace" "should be understood not in the sense that grace has been taken away from them, but in the sense that they have turned their backs on it. One may also say 'you have put yourself in a place where God cannot be good to you, or show you His goodness'" (UBS Handbook, p. 122). "Fallen from grace" is not speaking about the Armenian doctrine of losing salvation by one's sins; rather, it is speaking of turning from the method of salvation (grace) to seeking salvation by another way.