I said, “I will watch my ways
and keep my tongue from sin;

I will put a muzzle on my mouth
while in the presence of the wicked.”

So I remained utterly silent,
not even saying anything good.

But my anguish increased;
my heart grew hot within me.

While I meditated, the fire burned;
then I spoke with my tongue:

“Show me, Lord, my life’s end
and the number of my days;
let me know how fleeting my life is.

You have made my days a mere handbreadth;
the span of my years is as nothing before you.

Everyone is but a breath,
even those who seem secure.

“Surely everyone goes around like a mere phantom;
in vain they rush about, heaping up wealth
without knowing whose it will finally be.

“But now, Lord, what do I look for?
My hope is in you.

Save me from all my transgressions;
do not make me the scorn of fools.

I was silent; I would not open my mouth,
for you are the one who has done this.

Remove your scourge from me;
I am overcome by the blow of your hand.

When you rebuke and discipline anyone for their sin,
you consume their wealth like a moth—
surely everyone is but a breath.

“Hear my prayer, Lord,
listen to my cry for help;
do not be deaf to my weeping.

I dwell with you as a foreigner,
a stranger, as all my ancestors were.

Look away from me, that I may enjoy life again
before I depart and am no more.”

--

It goes in detail on why you were made for a purpose. It reassures me.