Ar-Rumi's Words of Wisdom

Ever came across a masterpiece called 'The Rubaiyat' by Jalalluddin Ar'Rumi?

Such strong words from The Rubaiyat expressed his calm and sure state of mind. I find his words of wisdom simply incredible:

“I died as a mineral and became a plant,
I died as plant and rose to animal,
I died as animal and I was Man.
Why should I fear? When was I less by dying?
Yet once more I shall die as Man, to soar
With angels blest; but even from angelhood
I must pass on: all except God doth perish.
When I have sacrificed my angel-soul,
I shall become what no mind e'er conceived.
Oh, let me not exist! for Non-existence
Proclaims in organ tones,
'To Him we shall return."