I'm reading through the Bible this year (at least that's the plan) using the ESV Study Bible plan since I recently bought this precious resource. Here's today's Psalm:
3:1 O Lord, how many are my foes!
Many are rising against me;
2 many are saying of my soul,
there is no salvation for him in God. Selah 
3 But you, O Lord, are a shield about me,
my glory, and the lifter of my head.
4 I cried aloud to the Lord,
and he answered me from his holy hill. Selah
5 I lay down and slept;
I woke again, for the Lord sustained me.
6 I will not be afraid of many thousands of people
who have set themselves against me all around.
7 Arise, O Lord!
Save me, O my God!
For you strike all my enemies on the cheek;
you break the teeth of the wicked.
8 Salvation belongs to the Lord;
your blessing be on your people! Selah
I'm struck by that phrase in v. 3- about the Lord being "my glory and the lifter of my head". When I'm feeling downcast which I happen to feel today, it's important to know at some level, that I do not have to lift up my own head on my head but can cry out to the Lord to do this for me. He may and has used others to aid in this task.
I cry out to the Lord today in my brokenness and in my sin.