Rev. more literally, “were enriched.” Compare Col 3:16; and see on Rom 2:4.
Utterance - knowledge (λόγῳ - γνώσει)
The two words are found together, 1Co 12:8; 2Co 11:6; 2Co 8:7. For knowledge, see on Rom 11:33. Utterance, aptitude in speech. Paul gives thanks for speech as a means of testifying for Christ. “The saints have never been silent” (Pascal).