it is fitting: what is proper and becoming, in keeping with who someone is or what a situation calls for.
The word makes a simple claim: something is fitting, proper, or becoming, in keeping with who a person is or what the moment calls for. It says an action suits its situation, not that it is commanded. That is why a New Testament writer reaches for it instead of the ordinary words for "must" (δεῖ) or "ought" (ὀφείλω): the point is a good match, a congruity, rather than raw obligation.
In the letters it usually measures behavior against identity. Certain conduct simply befits people who are holy, women who profess reverence for God, or teaching that is healthy, and the opposite conduct clashes with what they are. Paul can even put the question to a congregation's own sense of what is seemly and let them judge for themselves.
In a handful of places the reference point rises higher, and the word measures an act against God himself: what befits God's saving plan and character. At Jesus's baptism it marks the act as suited to God's purpose, and twice in Hebrews it makes a bold claim, that it was fitting for God to bring his Son to glory through suffering. That turns an old philosophical rule, that nothing unworthy may be said of God, on its head.
Nuances
Whether ἔπρεπεν in Hebrews 2:10 states that saving through suffering was appropriate and congruous for God, or that it was in some sense necessary.
- majorityAppropriateness, not necessity: the word states that the path of suffering fits God's character and saving purpose, without asserting logical necessity.; Harold W. Attridge, The Epistle to the Hebrews (Hermeneia; Fortress, 1989), 78-83; Paul Ellingworth, The Epistle to the Hebrews (NIGTC; Eerdmans, 1993), on 2:10; Craig R. Koester, Hebrews (Anchor 36; Doubleday, 2001), on 2:10
- minorityFitting and, in effect, necessary: the fittingness shades into inevitability given God's purpose.; James Moffatt, A Critical and Exegetical Commentary on the Epistle to the Hebrews (ICC; T&T Clark, 1924), 30-31