Paul warns that all who rely on keeping the law to be righteous will fail and be cursed by God, but Jesus took the curse of the law upon Himself when He died on the cross. It is faith in Christ alone that brings righteousness.

Galatians 3:10–14

The Righteous Shall Live by Faith

10 For all who rely on works of the law are under a curse; for it is written, “Cursed be everyone who does not abide by all things written in the Book of the Law, and do them.” 11 Now it is evident that no one is justified before God by the law, for “The righteous shall live by faith.”¹ 12 But the law is not of faith, rather “The one who does them shall live by them.” 13 Christ redeemed us from the curse of the law by becoming a curse for us—for it is written, “Cursed is everyone who is hanged on a tree”—14 so that in Christ Jesus the blessing of Abraham might come to the Gentiles, so that we might receive the promised Spirit² through faith.

Footnotes

[1] 3:11 Or The one who by faith is righteous will live
[2] 3:14 Greek receive the promise of the Spirit

(ESV)