Rumi's poem 'The Guest House' is one of his most interesting and well-recited. For those of us living mindfully, it's a useful reminder of the challenges we constantly face when dealing with the darker aspects of the mind.
The Guest House
This being human is a guest house.
Every morning a new arrival.
A joy, a depression, a meanness,
some momentary awareness comes
as an unexpected visitor.
Welcome and entertain them all!
Even if they are a crowd of sorrows,
who violently sweep your house
empty of its furniture,
still, treat each guest honourably.
He may be clearing you out
for some new delight.
The dark thought, the shame, the malice.
meet them at the door laughing and invite them in.
Be grateful for whatever comes.
because each has been sent
as a guide from beyond.
— Jellaludin Rumi,
And if you're looking for a more visual version of this poem then check out the Zen Pencils Comic.