1 Timothy 2:10

ἀλλʼ ὃ πρέπει : It has been assumed above that διʼ ἔργων ἀγαθῶν is to be connected with κοσμεῖν. In this case ὃ πρέπει θεοσέβειαν is a parenthetical clause in apposition to the sentence. It is, however, possible, though not so natural, to connect διʼ ἔργων ἀγαθῶν with ἐπαγγ. θεοσ. So Vulg., promittentes pietatem per bona opera. Then ὃ would mean καθʼ ὃ, or ἐν τούτῳ ὅ (Math.), and the whole clause, ἀλλʼ ὃ ἀγαθῶν, would be an awkward periphrasis for, and repetition of, ἐν καταστολῇ σωφροσύνης.

ἐπαγγέλλεσθαι usually means to promise as in Titus 1:2; but here and in 1 Timothy 6:21 to profess.

θεοσέβεια : ἅπ. λεγ., but the adj. θεοσεβής occurs John 9:31.

διά is instrumental, as in 1 Timothy 4:5; 2 Timothy 1:6; 2 Timothy 1:10; 2 Timothy 1:14; 2Ti 3:15; 2 Timothy 4:17; Titus 3:5-6, not of accompanying circumstances, as in 1 Timothy 2:15; 1 Timothy 4:14; 2 Timothy 2:2.

ἔργων ἀγαθῶν : see note on chap. 1 Timothy 3:1.