The teachers of Israel knew not, nor believed in the total corruption of man-Jew as well as Gentile-and therefore, felt not the need of a Savior. They could not understand it, how 'Except a man'-at least a Jew-were 'born again; and, 'from above; he could not enter, nor even see, the Kingdom of God.
7.....It behoveth you to be born from above;
8 the Spirit where he willeth doth blow, and his voice thou dost hear, but thou hast not known whence he cometh, and whither he goeth; thus is every one who hath been born of the Spirit.`
9 Nicodemus answered and said to him, `How are these things able to happen?`
10 Jesus answered and said to him, `Thou art the teacher of Israel -- and these things thou dost not know! Jn 3 YLT