The Rubaiyat of Omar Khayyam
رباعیات عمر خیام‎ translated by Edward FitzGerald

I love Sufi Poetry and The Rubaiyat of Omar Khayyam is the most beautiful, in my opinion.  It has mystical imagery that lends itself to great symbolic art.  The poem's central symbol is 'Wine', which is esoterically much more than the physical drink.  I see it as a symbol of love and the appreciation of life, among other meanings.

Omar Khayyam was a Persian poet and astronomer, born in the latter half of the llth Century.