Proverbs 21:28

that heareth Either (1) who listens to the voice of duty and of conscience (ἀνὴρ ὑπήκοος, LXX.; vir obediens, Vulg.); or (2) who simply states in evidence what he has heard, "the truth, the whole truth, and nothing but the truth" (qui non nisi quæ ipse audivit testatur Maurer). Comp. ὃ ἑωράκαμεν καὶ ἀκηκόαμεν ἀπαγγέλλομεν ὑμῖν, 1 John 1:3.

constantly Lit. for ever, so as to endure, R.V. marg. He will live on to speak, in contrast to the false witness who will perish. This preserves the parallelism better than shall speak unchallenged, (R.V. text), i.e. shall speak on, without being interrupted by cross-questioning, or objection, because his testimony will carry conviction, and be listened to with respectful silence.