Leithart richly exalts and defines justification:
Justification means being made right with God through Christ, through the faithful death of Christ.
Justification by faith means that righteousness is given to us, not through the law but through the cross, which we receive by faith.
Justification means that Christ lives in me, and I no longer live and the life I live in the body I live by faith in the Son of God.
Justification means that God has created a community of the justified, a community united without division of Jew or Greek, slave or free, male or female, Lutheran or Methodist, Baptist or Catholic.
Justification means that righteousness has come, the righteousness by which God will restore the world.
Justification means that God’s promises to Abraham have been fulfilled, and that we are swept up in that fulfillment.
Justification means that God is blessing the families of the earth through the seed of Abraham.
Justification means that the Spirit has been given to those who hear with faith, the Spirit that fulfills the promise to Abraham, the Spirit of righteousness and justice, the Spirit of life and renewal.
Justification, finally, means that this is all God’s work, and that all of God has done all this. The Father sent the Son whose death brought righteousness, which is the gift of the Spirit. The Father counts as righteous those who are in the Son, and shows His acceptance of us by giving us the Abrahamic promise, the Spirit. Justification means that the Triune God is God, Just and the justifier of those who have faith in Jesus.
Justification means that in Christ’s death and resurrection, the Triune God has revealed His righteousness, the undying commitment of the Father, the Son, and the Spirit to their own eternal communion, the eternal, undying, triumphant commitment to incorporate us, the seed of Abraham, into that communion.