Yet this essential divergence is not based on fatalistic grounds, but on moral ones. The argument of the twenty-fourth verse explains the description of vers 23. The ground of this utter alienation is the lack of belief, which will leave them in their sins to die.
He said to them, Ye are from beneath; I am from above. You spring from the lower as opposed to the higher world; you are influenced by considerations drawn from the earthly, sensual, superficial, and transitory.
It is not necessary to suppose that our Lord is clenching the Jews' harsh speech about the underworld with a tu-quoque, as though they verily belonged to the Gehenna to which they were consigning him; for the next pair of clauses are in parallel apposition with the former.
In the words, Ye are of this world; I am not of this world, "This world" corresponds with the τῶν κάτω of the previous clause, and the "not of this world" corresponds with the τὰ ἄνω, the heavenly regions from which he has continually declared, in many varieties of phrase, that he had come, or descended, or been sent.
Certainly and broadly speaking, this is true, as a contrast between Christ and all other men before their regeneration. Our Lord especially charges home upon these earth-bound souls, on these purely human, selfish, unspiritual, unrenewed, unbelieving men, this antagonism to himself, this refusal to walk in his light or receive his life.
"That which is born of the flesh is flesh" (John 3:6). They are flesh. He does not exclude them forever from such participation in his own heavenly life as would reverse the descriptive and characteristic features of their being.
The reason why they have not seen the kingdom or the King is that they are not born of the Spirit.