In these evil days wherein we live, I hear many daily complaining that there is such difference and contrariety among preachers, they know not what to do nor scarce what to believe. My answer is, Do but your own duty, and this trouble is at an end. Is there any contrariety in the book of God? Pin not your faith upon men’s opinions; the Bible is the touchstone. That there is such diversity amongst teachers is their fault, who should think all the same thing; but that this is so troublesome to you is your own fault, for neglecting your duty of trying all things by the word. Alas!, you are in a miserable condition, if you have all this while relied on the authority of men in heavenly things.
The Duty of Pastors and People Distinguished (1644) John Owen