If I told you earthly things and you don't believe, how will you believe if I tell you heavenly things?

 Nicodemus was driven back on another defence. In effect he said: "This rebirth about which you talk may be possible; but I can't understand how it works." The answer of Jesus depends for its point on the fact that the Greek word for spirit, pneuma ( G4151) , has two meanings. It is the word for spirit, but it is also the regular word for wind. The same is true of the Hebrew word ruach ( H7307) ; it too means both spirit and wind. So Jesus said to Nicodemus: "You can hear and see and feel the wind (pneuma, G4151) ; but you do not know where it comes from or where it is going to. You may not understand how and why the wind blows; but you can see what it does. You may not understand where a gale came from or where it is going to, but you can see the trail of flattened fields and uprooted trees that it leaves behind it. There are many things about the wind you may not understand; but its effect is plain for all to see." He went on, "the Spirit (pneuma, G4151) is exactly the same. You may not know how the Spirit works; but you can see the effect of the Spirit in human lives." 