But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned. – 1 Corinthians 2:14

“Lord, open Thou the eyes of the young man, that he may see!” – 2 Kings 6:17

We should pray that our friends may have their eyes opened to see all manner of spiritual truth. These optics of ours can only see natural objects: that is all they are intended for. We should be very grateful that our eyes can see as much as they do see; but spiritual objects are not discernible by the eyes of the body, which are for material objects only. The things which pertain to the spiritual kingdom must be perceived by eyes of a spiritual sort, eyes opened by the Lord. God must give to us spiritual senses before we can discern spiritual things: let this never be forgotten. There are those sitting among us who cannot discern spiritual things, for they have not the needed faculties. Carnal men and carnal women see only carnal things. The flesh cannot grasp, perceive, or discern the things of the Spirit. We must become spiritual, and receive spiritual faculties, before we can perceive spiritual things; in a word, we must be “born again.” “The natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned.” Hence the need of the prayer, “Lord, open Thou the eyes of the young man, that he may see!”

Once let the miracle-working power of God open our eyes, and we see well enough; but till then we grope in the noon-day for that which is right before us. He that made the eye can open it. Sin cannot so darken the mind but that God can pour light into it. If we cannot make men see, we can at least lead them to the Master Oculist, who can rectify their sight. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/2215.cfm