Bede the Venerable — as excerpted in the Catena Aurea on Mark 1:2-3

“(ubi sup.) What he cried is revealed, in that which is subjoined, Prepare ye the way of the Lord, make his paths straight. For whosoever preaches a right faith and good works, what else does he but prepare the way for the Lord’s coming to the hearts of His hearers, that the power of grace might penetrate these hearts, and the light of truth shine in them? And the paths he makes straight, when he forms pure thoughts in the soul by the word of preaching.”