The following Psalm was written by David after he pretended to be insane in order to escape from King Achish (1 Samuel 21:10-15). David scratched on doors and drooled in order to give the appearance of being insane. For me, there is great beauty in this Psalm. It shows so clearly God's promise to those who are faithful to him, and gives specific instructions for living out that faithfulness.

1 I will praise the Lord at all times.
I will constantly speak his praises.
2 I will boast only in the Lord;
let all who are helpless take heart.
3 Come, let us tell of the Lord’s greatness;
let us exalt his name together.

4 I prayed to the Lord, and he answered me.
He freed me from all my fears.
5 Those who look to him for help will be radiant with joy;
no shadow of shame will darken their faces.
6 In my desperation I prayed, and the Lord listened;
he saved me from all my troubles.
7 For the angel of the Lord is a guard;
he surrounds and defends all who fear him.

8 Taste and see that the Lord is good.
Oh, the joys of those who take refuge in him!
9 Fear the Lord, you his godly people,
for those who fear him will have all they need.
10 Even strong young lions sometimes go hungry,
but those who trust in the Lord will lack no good thing.

11 Come, my children, and listen to me,
and I will teach you to fear the Lord.
12 Does anyone want to live a life
that is long and prosperous?
13 Then keep your tongue from speaking evil
and your lips from telling lies!
14 Turn away from evil and do good.
Search for peace, and work to maintain it.

15 The eyes of the Lord watch over those who do right;
his ears are open to their cries for help.
16 But the Lord turns his face against those who do evil;
he will erase their memory from the earth.
17 The Lord hears his people when they call to him for help.
He rescues them from all their troubles.
18 The Lord is close to the brokenhearted;
he rescues those whose spirits are crushed.

19 The righteous person faces many troubles,
but the Lord comes to the rescue each time.
20 For the Lord protects the bones of the righteous;
not one of them is broken!

21 Calamity will surely overtake the wicked,
and those who hate the righteous will be punished.
22 But the Lord will redeem those who serve him.
No one who takes refuge in him will be condemned.