All have sinned and come short of the glory of God (Romans 3:23). Based upon faith alone in Christ, we are justified before God. His sinless life and substitutionary death on the cross for sinners is the basis for our justification. Be justified by faith "through the redemption that is in Christ Jesus" (Romans 3:24).
Be justified by faith in Christ. "Therefore, having been justified by faith, we have peace with God through our Lord Jesus Christ" (Romans 5:1). Faith is trust and confidence, relying upon Christ alone. By faith in Christ, we are justified with God.
Be justified by grace through faith in Christ. Faith receives the grace of God in Christ. Faith is the evidence that we are justified before God. It is our assurance of faith. "Therefore it is of faith that it might be according to grace, so that the promise might be sure to all the seed" (Romans 4:16).
Be justified by faith in Christ unto righteousness. The only way we can become righteous before God is by faith alone in Christ. Righteousness is the gift of God to us in Christ. "But to him who does not work but believes on Him who justifies the ungodly, his faith is accounted for righteousness" (Romans 4:5).