I love Rumi's Little Book of Life: The Garden of the Soul, the Heart, and the Spirit. It's wonderful and here is one of my favorite poems.
"There are two intellects!
One is acquired from teachers and books,
from repetition and sciences, granting a sense of superiority
yet the effort to sustain it becomes a great burden.
It ends just as the water supply coming from outside
a house stops once the source has dried up.
The other intellect is God's gift.
With a fountainhead in the heart of Spirit
the water of knowledge bubbling from within
can never become stagnant or old.
Seek that fountain within yourself!"
(pg. 32, Rumi's Little Book of Life: The Garden of the Soul, the Heart, and the Spirit)