A Psalm of David.
The LORD is my light and my salvation -- so why should I be afraid? The LORD protects me from danger -- so why should I tremble?  (Psalm 27:1)  



A Song of Ascents of Solomon. 
Unless the Lord builds the house, They labor in vain who build it; Unless the Lord guards the city, The watchman stays awake in vain.  (Psalm 127:1)



Teach me to do Your will, For You are my God; Your Spirit is good. Lead me in the land of uprightness.  (Psalm 143:10)