"Except a man be born again, he cannot see the Kingdom of God" (John 3: 3)
Thus the Lord Jesus spoke to Nicodemus, a ruler of the Jews, and Nicodemus asked in amazement: “How can this be?” That is, how can a man be born again? Even to this day, many ask: “How can a sensual man become a spiritual man?” “How can a sinner become a righteous one?” “How can the grace of God enter a man and replace his sensual thoughts and will?” “How can the Holy Spirit illuminate the heart of man?” “How can water be changed into wine?” We know that when the Spirit of God descended upon the apostles, they became different men— new men, reborn men. We also know, from thousands of examples, how men of sensual thoughts and sensual life became spiritual men, regenerated men. Therefore, we know that it happened then and happens now, by the action of the grace of God the Holy Spirit. It is not necessary for us to ask how this happens. It is enough for us to know that it does happen, and to strive that it happen in us, for the grace of the Spirit is given to everyone who seeks it and prepares himself to be able to receive it. There is no more difficult task than to explain spiritual things to men who think and judge only sensually. St. John Chrysostom says: “A soul which is given over to passions cannot achieve anything great and noble, for it suffers from a grievous blindness, like that of eyes darkened by the flow of pus.” Usually the most sensual men inquire about the greatest divine mysteries. They do not inquire about that in order to know how they can be saved, but rather to confuse the faithful and to ridicule the Faith, and to justify their own sinful and passionate life. Unable to raise themselves to the first rung of the heavenly ladder, they fantasize about the last rung. Brethren, when such as these inquire about the profoundest mysteries of the regeneration of the soul and the Kingdom of Heaven, ask them, first of all, to fulfill the ten basic commandments of God. If they do this, then their souls will be opened to the understanding of the Divine Mysteries, inasmuch as that understanding is necessary for the cleansing of their sins and passions, and for eternal salvation. O Lord Jesus Christ, our Most-gracious and All-wise Teacher, help us to understand with our minds, and embrace with our hearts, as much of Thy wisdom as is necessary for our salvation. Help us to keep ourselves from undue curiosity. To Thee be glory and praise forever. Amen.
Velimirovic, Saint Nikolai (2012-09-01). The Prologue of Ohrid (Kindle Locations 18633-18647). Sebastian Press Publishing House. Kindle Edition.