To someday, somehow, get at least one person safely to their destination. It changes the judicial standing of a convicted sinner and imputes to him a righteous standing before God so that the individual is declared to be fully righteous in God's sight. Often we link our justification with our performance. When we're not, we feel that our right standing with God has been forfeited. But this just isn't so.
Justification is a continual action.
A continual declaration by God of a right standing in Christ. An expiatory, an atoning victim, propitiation. It means to make amends or to reconcile. The Hebrew version of this word is used in the OT is used of the mercy seat of God which covered the Ark of the Covenant in the Holy of Holies. But it had no power to pay the penalty for a single sin.