Luke 18:41

Or, He asked the blind man to the end that we might believe, that without confession no man can be saved.

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. (ubi sup.) The blind man seeks from the Lord not gold, but light. Let us then seek not for false riches, but for that light which together with the Angels alone we may see, the way whereunto is faith.

And when he approached, he questioned him saying: What do you want me to do for you? And he said, Lord, that I may see. Did He who could give light not know what the blind man wanted? But He wishes that this be asked, which He knows beforehand that we would ask and He would grant. For He urgently admonishes us to prayer, and yet He says: Your Father knows what you need before you ask Him (Matthew VI). Therefore, He requires this, that it be asked; He requires this, that the heart be stirred to prayer. Wherefore the blind man immediately adds: Lord, that I may see. Behold, the blind man does not ask gold, but light from the Lord, he reckons it insignificant to ask for anything outside of light. Because even if the blind man can possess anything, without light he cannot see what he possesses. Let us therefore imitate him whom we have heard saved both in body and in mind, let us not seek false riches, not earthly gifts, not fleeting honors from the Lord, but light: namely that light which we can see only with the holy angels, which neither beginning initiates nor end confines. To which indeed light, the way is faith. Wherefore it is rightly added while illuminating the blind man: