Passage
For in that he died, he died unto sin once: but in that he liveth, he liveth unto God.
For in that he died, he died unto sin once: but in that he liveth, he liveth unto God.
Romans 6:8 Now if we be dead with Christ, we believe that we shall also live with him:
Romans 6:9 Knowing that Christ being raised from the dead dieth no more; death hath no more dominion over him.
Romans 6:10 For in that he died, he died unto sin once: but in that he liveth, he liveth unto God.
Romans 6:11 Likewise reckon ye also yourselves to be dead indeed unto sin, but alive unto God through Jesus Christ our Lord.
Romans 6:12 Let not sin therefore reign in your mortal body, that ye should obey it in the lusts thereof.
The verse centers on "died", "once", and "liveth". It is saying that the verse draws attention to "died" and "once", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 9's "Knowing that Christ being raised from the..." into verse 11's "Likewise reckon ye also yourselves to be...", so "died" and "once" belong inside that flow. In Romans context, the local focus is righteousness by faith, union with Christ, life in the Spirit, and God's covenant faithfulness.
A plain takeaway is to answer the verse's own emphasis on "died" and "once" with trust shaped by these words, not by a vague optimism outside the passage.