I try desperately to run through the sand
As I hold the water in the palm of my hand
'Cause it's all that I have and it's all that I need and
The waves of the water mean nothing to me
But I try my best and all that I can
To hold tightly onto what's left in my hand
But no matter how, how tightly I will strain
The sand will slow me down and the water will drain
I'm just being dramatic, in fact, I'm only at it again
As an addict with a pen, who's addicted to the wind
As it blows me back and forth, mindless, spineless, and pretend
Of course I'll be here again, see you tomorrow, but it's the end of today
End of my ways as a walking denial
My trial was filed as a crazy suicidal head case
But you specialize in dying, you hear me screaming "father"
And I'm lying here just crying, so wash me with your water
- Twenty one pilots

Nobody thinks what I think
Nobody dreams when they blink
Think things on the brink of blasphemy
I'm my own shrink
Think things are after me, my catastrophe
I'm a kitchen sink
You don't know what that means
Because a kitchen sink to you
Is not a kitchen sink to me, okay, friend?
Are you searching for purpose?
Then write something, yeah it might be worthless
Then paint something then, it might be wordless
Pointless curses, nonsense verses
You'll see purpose start to surface
No one else is dealing with your demons
Meaning maybe defeating them
Could be the beginning of your meaning, friend
-Twenty One pilots

What they're trying to say, is that, when you feel that life has no purpose, and aren't living for anything anymore, then make something, weather it be, a poem, a song, a painting, or anything. As long as it matters to you, and you know what it means, then you have purpose, because if you die, then who else is gonna know what it means to you?

Depression isn't a pretty girl with a flawless face crying
Depression isn't a bad day
Depression isn't grief from a loss of a loved one
Depression isn't a thing
Depression is the loss of something
Depression is the loss of happiness
Depression is where you lose yourself
and try to find yourself within your skin.

If you asked me my mood today  
I couldn't answer
If you asked me "how have you been"
I would lie
because lying
is an alternative to dying
and reassuring yourself that you'll be alright.