At religious instruction classes, I encountered The Pilgrims Progress by John Bunyan, and the sincerity of the traveller in that book was overwhelming.
But I recognize no infallible authority, even in special questions; consequently, whatever respect I may have for the honesty and the sincerity of such or such an individual, I have no absolute faith in any person.
You can take all the sincerity in Hollywood, place it in the navel of a fruit fly and still have room enough for three caraway seeds and a producer's heart.