I didn't recognize him, but he who sent me to baptize in water, he said to me, 'On whomever you will see the Spirit descending, and remaining on him, the same is he who baptizes in the Holy Spirit.'

 It may be that Jesus smiled. He quoted the old story of Jacob at Bethel who had seen the golden ladder leading up to heaven ( Genesis 28:12-13). It was as if Jesus said: "Nathanael, I can do far more than read your heart. I can be for you and for all men the way, the ladder that leads to heaven." It is through Jesus and Jesus alone that the souls of men can mount the ladder which leads to heaven. 