It is only by hearsay (by word of mouth passed down from...

It is only by hearsay (by word of mouth passed down from generation to generation) that whole peoples adore the God of their fathers and of their priests: authority, confidence, submission and custom with them take the place of conviction or of proofs: they prostrate themselves and pray, because their fathers taught them to prostrate themselves and pray: but why did their fathers fall on their knees?