justification by faith

God declares sinners righteous on the basis of Christ's work, received through faith rather than earned through law-keeping. Paul builds this argument across Romans and Galatians by reaching back to Abraham, whom God credited with righteousness because he believed (Genesis 15#15:6, Romans 4#4:3, Galatians 3#3:6).

Paul's logic in Galatians runs in a chain: the law cannot give life (Galatians 3#3:21), anyone who fails to keep the whole law falls under its curse (Galatians 3#3:10, quoting Deuteronomy 27#27:26), and Habakkuk declared that the righteous live by faith (Habakkuk 2#2:4, Galatians 3#3:11). Christ absorbed the curse so that Abraham's blessing could reach the Gentiles (Galatians 3#3:13-14).

The result: believers are adopted as children (Galatians 4#4:4-5) and united as Abraham's offspring (Galatians 3#3:28-29). N.T. Wright reads justification as God's declaration that someone belongs to his covenant people. John Piper reads it as God's imputation of Christ's righteousness to the believer. Both locate the ground of justification outside the believer, in Christ.

This doctrine holds together with holiness and obedience: justification frees believers to pursue good works as fruit rather than earning (Galatians 5#5:6, Ephesians 2#2:8-10, James 2#2:14-26).

Key Passages

Genesis 15#15:6, Habakkuk 2#2:4, Romans 3#3:21-26, Romans 4#4:1-8, Galatians 2#2:16, Galatians 3#3:6-14, Galatians 3#3:21-29, Ephesians 2#2:8-10

Vault Notes

References

Justification — Wright's covenantal reading of justification
The Future of Justification — Piper's response defending imputation
Galatians — Tenney's commentary on the Galatians argument
The Whole Christ — Ferguson on the law-gospel relationship and assurance