The two verses that leaped out at me, in this set of chapters, was chapter 12:4&5.
"...Praise the Lord, call upon his name, declare his doings among the people, make mention that his name is exalted.
Sing unto the Lord; for he hath done excellent things: this is known in all the earth."
We are to tell everyone of the wonderful story of Jesus Christ and how God can save us.
The post for Psalms 9-11 will be coming up soon.