Gregory the Great
Catena Aurea · Johannesevangelium 1
And this is the record of John, when the Jews sent priests and Levites from Jerusalem to ask him, Who art thou? And he confessed, and denied not; but confessed, I am not the Christ. And they asked him, What then? Art thou Elias? And he saith, I am not. Art thou that prophet? And he answered, No. Then said they unto him, Who art thou? that we may give an answer to them that sent us. What sayest thou of thyself? He said, I am the voice of one crying in the wilderness, Make straight the way of the Lord, as said the prophet Esaias. And he said, I am not. Then said they unto him, Who art thou? that we may give an answer to them that sent us. What sayest thou of thyself?
(Hom. vii. in Evang. c. 2) The way of the Lord is made straight to the heart, when the word of truth is heard with humility; the way of the Lord is made straight to the heart, when the life is formed upon the precept.