“The pastor ought to have two voices: one, for gathering the sheep, and another for warding off and driving away wolves and thieves. The Scripture supplies him with the means of doing both, for he who is deeply skilled in it will be able both to govern those who are teachable, and to refute the enemies of the truth.” – John Calvin’s Commentaries on the Epistles to Timothy, Titus, Philemon.
“Therefore I solemnly witness before God and the Lord Jesus Christ, who is going to judge the living and the dead according to His appearance and His kingdom, preach the Word, be instant in season and out of season, reprove, rebuke, exhort with all long-suffering and doctrine. For a time will be when they will not endure sound doctrine, but they will heap up teachers to themselves according to their own lusts, tickling the ear. And they will turn away their ears from the truth and will be turned to myths. But you watch in all things, endure afflictions, do the work of an evangelist, fully carry out your ministry.” 2 Tim. 4:1-5