Revelation is not self evident, but this teaching is quite clear.

Jesus said you must be "born again" so you only question then remains how that is achieved. We should also look at scripture for that.

Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind, Nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners, shall inherit the kingdom of God. And such were some of you: but ye are washed, but ye are sanctified, but ye are justified in the name of the Lord Jesus, and by the Spirit of our God. [1 Corinthians 6:9-11]

Note, "by the Spirit of our God".

Now for John the Baptist prophesying of Jesus

I baptize you with water for repentance, but after me will come One more powerful than I, whose sandals I am not worthy to carry. He will baptize you with the Holy Spirit and with fire. [Matthew 3:11]

We are to be born again in the spirit with an indwelling of the Holy Spirit, as Jesus stated:

And I will pray the Father, and He shall give you another Comforter, that He may abide with you forever; Even the Spirit of truth; whom the world cannot receive, because it seeth Him not, neither knoweth Him: but ye know Him; for He dwelleth with you and shall be in you (John xiv.16, 17)

We read in Rom. viii.9, "If any man have not the Spirit of Christ he is none of His."

"The Indwelling Spirit Fully and Forever Satisfying." https://biblehub.com/library/torrey/the_person_and_work_of_the_holy_spirit/chapter_x_the_indwelling_spirit.htm