<p>3:31- see on Mt. 3:7.</p><p><i>He that comes from above is above all. He that is of the earth is of the earth, and of the earth he speaks. He that comes from heaven is above all</i>- As noted on :30, John felt his own diminution in the face of the eternal Kingdom, and before the Lord Jesus. The higher we perceive the Lord Jesus, the less problem we will have with ego, the more attainable will be the idea of truly selfless service. Nicodemus and the Jews didn't understand earthly things, and so they would not understand heavenly things (:12). This is a tacit admission that they did not at that point accept John's message, the earthly voice as opposed to the heavenly. See on :34.</p>