Jesus answered, Verily, verily, I say unto thee, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God. John 3:5.  {CC 292.1}  

     Nicodemus was astonished as well as indignant at these words. He regarded himself as not only an intellectual, but a pious and religious man. . . . He could not harmonize this doctrine of conversion with his understanding of what constituted religion. He could not explain to his own satisfaction the science of conversion; but Jesus showed him, by a figure, that it could not be explained by any of his precise methods. Jesus pointed out to him the fact that he could not see the wind, yet he could discern its action. He might never be able to explain the process of conversion, but he would be able to discern its effect. He heard  ...