John 3:3 - Wesley's Explanatory Notes

Jesus answered — That knowledge will not avail thee unless thou be born again — Otherwise thou canst not see, that is, experience and enjoy, either the inward or the glorious kingdom of God. In this solemn discourse our Lord shows, that no external profession, no ceremonial ordinances or privileges of birth, could entitle any to the blessings of the Messiah's kingdom: that an entire change of heart as well as of life was necessary for that purpose: that this could only be wrought in man by the almighty power of God: that every man born into the world was by nature in a state of sin, condemnation, and misery: that the free mercy of God had given his Son to deliver them from it, and to raise them to a blessed immortality: that all mankind, Gentiles as well as Jews, might share in these benefits, procured by his being lifted up on the cross, and to be received by faith in him: but that if they rejected him, their eternal, aggravated condemnation, would be the certain consequence. Except a man be born again — If our Lord by being born again means only reformation of life, instead of making any new discovery, he has only thrown a great deal of obscurity on what was before plain and obvious.