Conference of the Birds
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Conference of the Birds (Manteq at-Tair, 1177) is a mystic poem by Farid ud-Din Attar of approximately 4500 lines. The poem uses a journey by a group of birds as an allegory of sufism.
It's most famous section is:
Come you lost Atoms to your Centre draw,
And be the Eternal Mirror that you saw:
Rays that have wander'd into Darkness wide
Return and back into your Sun subside
Some more is available here