Passage
That every one of you should know how to possess his vessel in sanctification and honour;
That every one of you should know how to possess his vessel in sanctification and honour;
1 Thessalonians 4:2 For ye know what commandments we gave you by the Lord Jesus.
1 Thessalonians 4:3 For this is the will of God, even your sanctification, that ye should abstain from fornication:
1 Thessalonians 4:4 That every one of you should know how to possess his vessel in sanctification and honour;
1 Thessalonians 4:5 Not in the lust of concupiscence, even as the Gentiles which know not God:
1 Thessalonians 4:6 That no man go beyond and defraud his brother in any matter: because that the Lord is the avenger of all such, as we also have forewarned you and testified.
The verse centers on "should", "possess", "vessel", "sanctification", and "honour". It is saying that the verse draws attention to "should" and "possess", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 3's "For this is the will of God..." into verse 5's "Not in the lust of concupiscence even...", so "should" and "possess" belong inside that flow. In 1 Thessalonians context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "should" and "possess" with trust shaped by these words, not by a vague optimism outside the passage.