Origen
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?
(tom. vi. c. 10. 11) There is need of the voice crying in the wilderness, that the soul, forsaken by God, may be recalled to making straight the way of the Lord, following no more the crooked paths of the serpent. This has reference both to the contemplative life, as enlightened by truth, without mixture of falsehood, and to the practical, as following up the correct perception by the suitable action. Wherefore he adds, Make straight the way of the Lord, as saith the prophet, Esaias.