Psalm 3 speaks of the salvation and blessing found in a relationship with God, and the security and peace His people have when they look to Christ instead of our focusing on our trials.

Psalm 3

Save Me, O My God

A Psalm of David, when he fled from Absalom his son.

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.” Selah¹
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

Footnotes

[1] 3:2 The meaning of the Hebrew word Selah, used frequently in the Psalms, is uncertain. It may be a musical or liturgical direction

(ESV)