I would suggest reading the book during sessions of bibliomancy … that is a technique where you just open the book to a random place and what you most want to read will just appear. I find it is very good to read his poetry that way, and here is a few snippets that I've encountered this way... Note: Unless otherwise stated, these poems are taken from The Essential Rumi, translated by Coleman Barks.

You see things in two ways.
Sometimes you look at a person
and see a cynical snake.
Someone else sees a joyful lover,
and you're both right! (from page 75)

I love this... along with the obvious moral implications of Judge not, less ye be judged, their is the other meme about how each human has multiple lives with multiple people and each of these seem to make most people a bit more complex.

Think that you're gliding out from the face of a cliff
like an eagle. Think you're walking
like a tiger walks by himself in the forest.
You're most handsome when you're after food.

Spend less time with nightingales and peacocks.
One is just a voice, the other just a color.

My personal take on many of Rumi's poems, is that he has many of the elements that one would find in taoism (granted all truth converges onto one, right?), however, this alert hunger … ernestness even, is quite divergent.

This moment this love comes to rest in me,
many beings in one being.
In one wheat-grain a thousand sheaf stacks.
Inside the needle's eye, a turning night of stars.

from Unseen Rain

Wonderful imagery of the many things that God is on a personal level.

The breeze at dawn has secrets to tell you.
Don't go back to sleep.

You must ask for what you really want.
Don't go back to sleep.

People are going back and forth across
the doorsill where the two worlds touch.

The door is round and open.
Don't go back to sleep.