Passage
Be angry, and do not sin; let not the sun set upon your wrath,
Be angry, and do not sin; let not the sun set upon your wrath,
Ephesians 4:24 and [your] having put on the new man, which according to God is created in truthful righteousness and holiness.
Ephesians 4:25 Wherefore, having put off falsehood, speak truth every one with his neighbour, because we are members one of another.
Ephesians 4:26 Be angry, and do not sin; let not the sun set upon your wrath,
Ephesians 4:27 neither give room for the devil.
Ephesians 4:28 Let the stealer steal no more, but rather let him toil, working what is honest with [his] hands, that he may have to distribute to him that has need.
The verse centers on "angry", "upon", and "wrath". It is saying that the verse draws attention to "angry" and "upon", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 25's "Wherefore having put off falsehood speak truth..." into verse 27's "neither give room for the devil...", so "angry" and "upon" belong inside that flow. 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 "angry" and "upon" with trust shaped by these words, not by a vague optimism outside the passage.