"O Timothy, keep that which is committed to thy trust, avoiding profane and vain babblings, and oppositions of science falsely so called: Which some professing have erred concerning the faith.
Grace be with thee. Amen." (1 Timothy 6 : 20 - 21)

"Preach the word; be instant in season, out of season; reprove, rebuke, exhort with all long suffering and doctrine. For the time will come when they will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers, having itching ears; And they shall turn away their ears from the truth, and shall be turned unto fables." 
(2 Timothy 4 : 2 - 4)