Genesis: Jacob Wrestles with God

In the tense anxiety of the night, Jacob is waiting to see if his plan will succeed and if his brother will accept him. While waiting all alone in the night, God appeared in human form and wrestled Jacob throughout the night. Depriving Jacob of his natural strength, making him weak and yet declaring him the victor. What was the purpose of this wrestling, what did it mean for Jacob and what does it mean for us?