I do not trust in my bow;
I do not count on my sword to save me.
7 You are the one who gives us victory over our enemies;
you disgrace those who hate us.
8 O God, we give glory to you all day long
and constantly praise your name. Interlude Psalm 44:6-8
Lillie-Put 
It is to allow a moment to breathe to take in…a pause if you will to think and listen. I just took one. 🙂 It was much needed.
We need those things regularly. I wonder if that is why David included the Selah’s in his songs?