“If I have told you earthly things, and ye believe not, how shall ye believe, if I tell you of heavenly things?”
King James Version (KJV)
3:12 Earthly things - Things done on earth; such as the new birth, and the present privileges of the children of God. Heavenly things - Such as the eternity of the Son, and the unity of the Father, Son, and Spirit.
Joh 3:12 If I have told you earthly things, and ye believe not. He had spoken of the things that belonged to the kingdom of God on earth, of the new birth. If Nicodemus could not understand and believe this, how would he receive testimony concerning the heavenly kingdom, God, and eternal glory?