“There is in the unregenerate mind an incompetence, an incapacity, an inability to understand the things of the Spirit; and Christ’s repeated miracle in restoring sight to the naturally blind was designed to teach us our imperative need of the same divine power recovering spiritual vision to our souls….
The mind’s eye of the sinner is capable of perceiving natural things, but he has no ability to see spiritual things.
Holy Writ states that the one who “lacks these things,” namely, the graces of faith, virtue, knowledge, and so forth, mentioned in 2 Peter 1:5-7, is “blind, and cannot see afar off” (v. 9). The Book therefore urges him to receive “eyesalve” from Christ, that he may see (Rev. 3:18).
For this very purpose the Son of God came into the world: to give “deliverance to the captives, and recovering of sight to the blind” (Luke 4:18). ”
~ Arthur Pink, “The Doctrine of Man’s Impotence”