Better, the message (par excellence), the gospel message. Usually with a defining word, as of Jonah; of Jesus Christ; my preaching; our preaching. Absolutely, as here, 1Co 1:21; Tit 1:3.
Might be fully known (πληροφορηθῇ)
See on 2Ti 4:5. Lit. might be fulfilled; fully carried out by being proclaimed before rulers in the capital of the world. Comp. Rom 15:19; Act 23:11; Act 28:31; Phi 1:12-14.
Out of the mouth of the lion (ἐκ στόματος λέοντος)
Figurative expression for danger of death. Comp. 1Co 15:32. As usual, all manner of special references have been imagined: the lions of the amphitheatre; Nero; the chief accuser; the Jews; the Devil.