If you’re looking for a non-scriptural book full of wisdom and spiritual insight, I’d suggest the poetry of the 14th Century Persian poet Hafiz.  Amanda gave me this collection translated by Daniel Ladinsky for Christmas and I’ve been savoring it ever since.  This poem, for example, is one I need to sit with longer and make a part of me.

What is the key
To untie the knot of your mind’s suffering?

What
Is the esoteric secret
To slay the crazed one whom each of us
Did wed

And who can ruin
Our heart’s and eye’s exquisite tender landscape?

Hafiz has found
Two emerald words that
Restored
Me

That I now cling to as I would sacred
Tresses of my Beloved’s
Hair:

Act great.
My dear, always act great.

What is the key
To untie the knot of the mind’s suffering?

Benevolent thought, sound
And movement.