I'm going to subtitle this :
Gal 3:10
10 For as many as are of the works of the law are under the curse: for it is written, Cursed is every one that continueth not in all things which are written in the book of the law to do them.
Lets make no mistake about it, anyone claiming to be saved and or Justified before God based upon their faith, or their act of believing, you very well may be under the curse of the Law, simply because, faith whether you believe it or not, is a work of the Law Matt 23:23
23 Woe unto you, scribes and Pharisees, hypocrites! for ye pay tithe of mint and anise and cummin, and have omitted the weightier matters of the law, judgment, mercy, and faith: these ought ye to have done, and not to leave the other undone.
Faith Jesus says to these religionists, is one of the more weightier matters of the Law THAT OUGHT YE HAVE DONE !
John Gill on this verse and the word Faith in this context writes:
The Purpose of the Law was to be a Schoolmaster to Faith in Christ, yeah even under the Mosaic Administration Gal 3:24
24 Wherefore the law was our schoolmaster to bring us unto Christ, that we might be justified by faith.
So, now if we believe that our act of Faith in Christ is the reason why God Justified us, we are claiming that God Justified me because I obeyed the Law, did that which I ought to have done !
And once our thinking is there, we fall into the ripe condition of our text Gal 3:10
10 For as many as are of the works of the law are under the curse: for it is written, Cursed is every one that continueth not in all things which are written in the book of the law to do them.
That means if we are under the impression that by doing Faith, a work of the Law, is the basis why God saved or Justified me, we are then obligated to continue to be in obedience to the Law perfectly, if we are to saved from the penalty of our sins, and one false move to complete obedience to the Law, in act, thoughts, or speech disqualifies us from Eternal Life, and must be Eternally Cursed as these Matt 25:41
41 Then shall he say also unto them on the left hand, Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels:
That word cursed here is the same word in Gal 3:10 ! So they are cursed for not keeping God's Law as they ought to have done ! And so are we if we continue in the thinking that , God Justifies me because of my act of Faith or Believing, which i ought to have done !