Gregory the Great — as excerpted in the Catena Aurea on Luke 18:35-43

“(Hom. 2. in Ev.) Or, blindness is a symbol of the human race, which in our first parent knowing not the brightness of heavenly light, now suffers the darkness of his condemnation. Jericho is interpreted ‘the moon,’ whose monthly wanings represent the feebleness of our mortality. While then our Creator is drawing nigh to Jericho, the blind is restored to sight, because when God took upon Him the weakness of our flesh, the human race received back the light which it had lost. He then who is ignorant of this brightness of the everlasting light, is blind. But if he does no more than believe in the Redeemer who said, I am the way, the truth, and the life; (John 13:6.) he sits by the way side. If he both believes and prays that he may receive the everlasting light, he sits by the way side and begs. Those that went before Jesus, as He was coming, represent the multitude of carnal desires, and the busy crowd of vices which before that Jesus comes to our heart, scatter our thoughts, and disturb us even in our prayers. But the blind man cried out the more; for the more violently we are assailed by our restless thoughts, the more fervently ought we to give ourselves to prayer. As long as we still suffer our manifold fancies to trouble us in our prayers, we feel in some measure Jesus passing by. But when we are very stedfast in prayer, God is fixed in our heart, and the lost light is restored. Or to pass by is of man, to stand is of God. The Lord then passing by heard the blind man crying, standing still restored him to sight, for by His humanity in compassion to our blindness He has pity upon our cries, by the power of His divinity He pours upon us the light of His grace. Now for this reason He asks what the blind man wished, that He might stir up his heart to prayer, for He wishes that to be sought in prayer, which He knows beforehand both that we seek and He grants.”