Romans 6:10-11 — For in that He died, He died unto sin once: but in that He liveth, He liveth unto God.
Likewise reckon ye also yourselves to be dead indeed unto sin, but alive unto God through Jesus Christ our Lord.
once = once for all, completely as opposed to once upon a time. It emphasizes the absolute sufficiency and finality of the death of Christ for all the purposes for which He died.
liveth unto God — He has nothing more to do with sin
reckon — know something to be true and live accordingly. It carries the idea of a mathematical calculation
dead = dead indeed, permanent state — our spiritual condition and our attitude toward sin
through Jesus Christ — should be "in Jesus Christ"
Thus the redemptive work of Christ in the sinner's behalf stands between the believer and his sins (1 Corinthians 15:3; Ephesians 1:7), between the believer and his sin (2 Corinthians 5:21), and between the believer and his sinning (Romans 6:1-14). — Cornelius R. Stam, The Epistle of Paul to the Romans, pg. 148.
God provides a way for us to escape sin. 1 Corinthians 10:13 — There hath no temptation taken you but such as is common to man: but God is faithful, who will not suffer you to be tempted above that ye are able; but will with the temptation also make a way to escape, that ye may be able to bear it. Romans 6:11 speaks of this escape — look to Christ and reckon yourself free.