They are justified freely by His grace through the redemption that is in Christ Jesus.Romans 3:24(HCSB)
The only way that man can be justified and made right with God is through the blood of the Lord Jesus Christ. The only way that man can have his sins forgiven and be redeemed from sin, death and hell is because Christ Jesus paid the price in full. The only way man can have his unrighteousness replaced with the righteousness of God is by being born from above and positioned in Christ. The only way that a man can be saved is to believe on the Lord Jesus Christ.
Justification is a free gift of God's grace to man, but at an enormous cost to the Father. The price of our redemption was bestowed on us freely and without any cost to us, but at a tremendous price to the Lord. The inestimable and eternal riches of God are given freely to every-man at the expense of Christ's own life, and all one has to do is to believe on the Lord Jesus Christ and you will be saved.
Salvation is by God's GRACE as opposed to merit. Salvation is FREE from God and is not a reward. Salvation is without cost and cannot be earned. Salvation is given through God's favour and can never rest on man's merit, man's demands, or man's work and salvation can never be gained as a reward, payment or by some other measure of man's worthiness - it is by grace alone through faith alone in Christ alone.
Oh, Father I am sinful and deserve nothing but death and hell from a holy and righteous God but thank You that I am justified FREELY by GRACE through the REDEMPTION that is in CHRIST JESUS - to Him be praise and glory forever, AMEN