Passage
be angry and do not sin; let not the sun go down upon your wrath,
be angry and do not sin; let not the sun go down upon your wrath,
Ephesians 4:24 and to put on the new man, which, according to God, was created in righteousness and kindness of the truth.
Ephesians 4:25 Wherefore, putting away the lying, speak truth each with his neighbour, because we are members one of another;
Ephesians 4:26 be angry and do not sin; let not the sun go down upon your wrath,
Ephesians 4:27 neither give place to the devil;
Ephesians 4:28 whoso is stealing let him no more steal, but rather let him labour, working the thing that is good with the hands, that he may have to impart to him having need.
The verse centers on "angry", "down", "upon", and "wrath". It is saying that the verse draws attention to "angry" and "down", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 25's "Wherefore putting away the lying speak truth..." into verse 27's "neither give place to the devil...", so "angry" and "down" 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 "down" with trust shaped by these words, not by a vague optimism outside the passage.