Passage
For this reason I, Paul, the prisoner of Christ Jesus on behalf of you Gentiles—
For this reason I, Paul, the prisoner of Christ Jesus on behalf of you Gentiles—
Ephesians 3:1 For this reason I, Paul, the prisoner of Christ Jesus on behalf of you Gentiles—
Ephesians 3:2 if indeed you heard of the stewardship of God’s grace which was given to me for you;
Ephesians 3:3 that by revelation there was made known to me the mystery, as I wrote before in brief.
The verse centers on "reason", "paul", "prisoner", "christ", "jesus", "behalf", and "gentiles". It is saying that the verse draws attention to "reason" and "paul", so its meaning should be read from those terms before moving to application.
The next verse adds "if indeed you heard of the stewardship...", so "reason" and "paul" should be read forward into that movement. In Ephesians context, the local focus is grace, union with Christ, the church, and new creation.
A plain takeaway is to answer the verse's own emphasis on "reason" and "paul" with trust shaped by these words, not by a vague optimism outside the passage.