'Once for All' in the Bible

For the death that He died, He died to sin [ending its power and paying the sinner’s debt] once and for all; and the life that He lives, He lives to [glorify] God [in unbroken fellowship with Him].

I am speaking in [familiar] human terms because of your natural limitations [your spiritual immaturity]. For just as you presented your bodily members as slaves to impurity and to [moral] lawlessness, leading to further lawlessness, so now offer your members [your abilities, your talents] as slaves to righteousness, leading to sanctification [that is, being set apart for God’s purpose].