Being justified freely by his grace through the redemption that is in Christ Jesus (Romans 3:24). God's grace freely given to you is redemption in Christ. It can never be bought, earned, nor achieved through personal effort. Redemption means that Jesus paid for all your sins at the cross. Believers are justified freely through his shed blood, and confirmed by his glorious resurrection. Be justified freely in Christ alone.
Be justified freely, and not by your works. It's all of grace, as the gift of God (Titus 3:5-7). God's grace is received freely by faith in Christ. His grace alone changes you from glory into glory. Christ in us is the fullness of God's grace. And of His fullness we have all received, and grace for grace (John 1:16). That's all of grace in Christ alone.
Be justified freely unto new life in Christ. God gives us abundant life, and life eternal in Christ alone. We may truly say, "But by the grace of God I am what I am" (1 Corinthians 15:10). All we are, or ever hope to be, is by God's grace in Christ.
Be justified freely with a change of heart. The Spirit of grace operates directly on our hearts, changing us from the inside out (Romans 2:28-29). The mind is changed to understand the things of God. The will is changed to please God. The emotions are changed to have a tender heart toward God.