solemn eschatological perspective by reminding him that he conducts himself under the gaze of God and Christ, that Christ (not those around him, whether opponents or faithful believers) is the one who will judge him
Preach the word refers back to “Scripture” (see 3:16) and thus includes proclaiming the “good news” of the gospel in a broad, biblically anchored sense. “Gospel” for Paul is not only an evangelistic presentation; the gospel is the core message (found in the whole of Scripture; cf. 3:16)
which can be applied to unbelievers (a call to faith) or to believers (a call to continue to believe in and live out the implications of this message).