What Is the Difference Between Body and Spirit?

Nicodemus, an elder of Israel, didn't get what Jesus was trying to tell him. He said in verse 9: "How can these things be?" In verses 12 and 14 he uses symbols from Moses that will help Nicodemus see the larger principles. If you just looked to the serpent on the pole, it would save your physical life,. And now he's saying if you look at the son of man who was sent by God to be raised up,you'll have everlasting life.