And by this phrase our Lord signifies, that no man, either as a man, or as a son of Abraham, or as a proselyte to the Jewish religion, can have any true knowledge of, or right unto, the enjoyment of the kingdom of God, unless he is born again; or regenerated, and quickened by the Spirit of God; renewed in the spirit of his mind; has Christ formed in his heart; becomes a partaker of the divine nature; and in all respects a new creature; and an other in heart, in principle, in practice, and conversation; or unless he be "born from above", as the word is rendered in ( John 3:31 ) ; that is, by a supernatural power, having the heavenly image stamped on him; and being called with an heavenly calling, even with the high calling of God in Christ Jesus: if this is not the case, a man can have no true knowledge of the kingdom of the Messiah, which is not a temporal and carnal one; it is not of this world, nor does it come with observation; nor can he have any right to the ordinances of it, which are of a spiritual nature; and much less can he be thought to have any true notions, or to be possessed of the kingdom of grace, which lies in righteousness, peace, and joy in the Holy Ghost; or to have either a meetness for, or a right unto the kingdom of glory: though by the following words it seems, that the word is rightly rendered "again", or a second time.
(Commentary John Gill)
(Commentary John Gill)