Can you write a poem about sadness?

Yes, here's a poem about sadness:

Sadness, oh sadness, why do you weigh me down,
Heavy on my shoulders like a heavy gown?
You cloak me in your darkness, consuming me whole,
Making it hard to find the light, to reach my goal.

You linger in my thoughts like a constant refrain,
A reminder of things lost, of things that cause me pain.
You make my heart heavy, my eyes filled with tears,
And I wonder if I'll ever be able to overcome my fears.

But even in the darkness, there is a glimmer of hope,
A faint ray of light that helps me to cope.
For though you may envelop me in your embrace,
I know that I'll find a way to escape.

So while sadness may linger, I'll hold onto my faith,
And hope that in time I'll find a brighter place.
For though you may try to drag me down,
I know that I'll find a way to rise above this frown.