Whom shall I fear?

Very sorry for falling behind on the blog.  I'll try to catch up a little.

Psalm 27 
The Lord is my light and my salvation;
    whom shall I fear?The Lord is the stronghold of my life;    of whom shall I be afraid?


These words state very simply what peace and joy I can have in life.  I think of the Nike slogan "No Fear" and know that God is the one who can really make that be true.

David was confident going into battle that God would be on his side against the heathen nations.  Where might these verses be true for us today?

What is important in verse 4?  (and again in verse 9)

At what times of life might verses 13 & 14 be especially comforting?