What's that Bible verse you turn back to when you are struggling?

Psalm 42:

2
As the deer longs for streams of water,

so my soul longs for you, O God.

3
My soul thirsts for God, the living God.

When can I enter and see the face of God?*

4
My tears have been my bread day and night,

as they ask me every day, “Where is your God?”

5
Those times I recall

as I pour out my soul,

When I would cross over to the shrine of the Mighty One,

to the house of God,

Amid loud cries of thanksgiving,

with the multitude keeping festival.

6
Why are you downcast, my soul;

why do you groan within me?

Wait for God, for I shall again praise him,

my savior and my God.

II
7
My soul is downcast within me;

therefore I remember you

From the land of the Jordan and Hermon,

from Mount Mizar,

8
Deep calls to deep

in the roar of your torrents,

and all your waves and breakers

sweep over me.

9
By day may the LORD send his mercy,

and by night may his righteousness be with me!

I will pray to the God of my life,

10
I will say to God, my rock:

“Why do you forget me?i

Why must I go about mourning

with the enemy oppressing me?”

11
It shatters my bones, when my adversaries reproach me,

when they say to me every day: “Where is your God?”

12
Why are you downcast, my soul,

why do you groan within me?

Wait for God, for I shall again praise him,

my savior and my God.