1 Timothy 3:13

purchase to themselves a good degree--literally, "are acquiring . . . a . . . step." Understood by many as "a higher step," that is, promotion to the higher office of presbyter. But ambition of rising seems hardly the motive to faithfulness which the apostle would urge; besides, it would require the comparative, "a better degree." Then the past aorist participle, "they that used the office of deacon well," implies that the present verb, "are acquiring to themselves boldness," is the result of the completed action of using the diaconate well. Also, Paul would not probably hold out to every deacon the prospect of promotion to the presbytery in reward of his service. The idea of moving upwards in Church offices was as yet unknown (compare Rom 12:7, &c.; Co1 12:4-11). Moreover, there seems little connection between reference to a higher Church rank and the words "great boldness." Therefore, what those who have faithfully discharged the diaconate acquire for themselves is "a good standing-place" [ALFORD] (a well-grounded hope of salvation) against the day of judgment, Ti1 6:19; Co1 3:13-14 (the figurative meaning of "degree" or "step," being the degree of worth which one has obtained in the eye of God [WIESINGER]); and boldness (resting on that standing-place"), as well for preaching and admonishing others now (Eph 6:19; a firm standing forth for the truth against error), as also especially in relation to God their coming Judge, before whom they may be boldly confident (Act 24:16; Jo1 2:28; Jo1 3:21; Jo1…

— Jamieson-Fausset-Brown Commentary (public domain)