One part of this work contends "One thing is certain and rest is lies The Flower that once blooms forever dies." It also advises "When the angel of the darker drink …offering 
One part of this work contends "One thing is certain and rest is lies The Flower that once blooms forever dies." It also advises "When the angel of the darker drink …offering his Cup ... fourth to your lips to quaff - you shall not drink." This work begins with images of "Stars before him from the Field of Night … The Sultan's Turret with a Shaft of Night," and its narrator notes "Ah, Wilderness" in this poem that shows "Earth could not answer, nor the seas mourn." A Flask of Whine, a Loaf of Bread, and a Book of Verses underneath the Bough are observed in the beginning of this set of poems titled after a word for "quatrain." For ten points, identify this medieval Iranian poetic work written by Omar Khayam.
One part of this work contends "One thing is certain and rest is lies
{Rubaiyat} of Omar Khayyam (accept reasonable {pronunciations})