Why is Nathanael immediately convinced that Jesus is the Son of God and the King of Israel when Jesus tells him: "I saw you while you were still under the fig tree before Philip called you"?

 Question: Why is Nathanael immediately convinced that Jesus is the Son of God and the King of Israel when Jesus tells him: "I saw you while you were still under the fig tree before Philip called you"?  

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See Answer: http://ebible.com/answers/48296?ori=664697