Wrestling with Satan

I was reading the book of Jude this morning and I came across an interesting passage in verse 9 that I must have glossed over the previous times that I read this.
  

"But Michael the archangel, when he disputed with the devil and argued about the body of Moses, did not dare pronounce against him a railing judgment, but said, "The Lord rebuke you!" (NASB)

Now I have no idea why they were arguing over the body of Moses, but the point of this verse seems to be that even Michael the chief of all the angels did not combat the devil in his own power, but said to him "The Lord rebuke you!"  

I have been going through some difficult times recently and have been wrestling with fear and condemnation.  It is so hard when you feel like you are pouring your heart and soul into something and it's just not working out the way that you would like.  Getting glimpses of progress only to see them quickly vanish.  All the while knowing the kind of hours and effort that I am putting forth only to hear "That's not good enough" and "What are you doing with your time?" 

As I read this passage I felt God saying, "I see your heart and your hard work and I will defend you."  It reminded me of the passage in Genesis 15:1 right before God makes His covenant with Abram.  He says to him, "Do not be afraid, Abram.  I am your shield, your very great reward." What a glorious thought!  He is our shield, our very great reward.  May we never forget that.