The Lord is my light and my salvation-whom shall I fear?
Though an army besiege me, my heart will not fear;
though war break out against, even then I will be confident.
For in the day of trouble he will keep me safe.
And so the psalm goes on, packed full of David's deep sense of God's faithfulness. He's not always this positive. David had his bad days when God seemed distant and faith was hard to find. But in these verses David truly celebrates God's presence and protection.
I celebrate it too.