The Moving Finger writes; and, having writ Moves on: nor all thy Piety nor Wit Shall lure it back to cancel half a line Nor all thy tears wash out a word of it.
Apropos for our profession of poetry I believe!
From Wikipedia: Omar Khayyam (/kaɪˈjɑːm/; Persian: عمر خیّام [oˈmæɾ xæjˈjɒːm]; 18 May 1048 – 4 December 1131) was a Persian mathematician, astronomer, and poet. He was born in Nishapur, in northeastern Iran, and spent most of his life near the court of the Karakhanid and Seljuq rulers in the period which witnessed the First Crusade.
The Princeton Encyclopedia of Poetry and Poetics quotes the tradition that the Persian quatrain-form, the ruba'i, originated in the gleeful shouts of a child, overheard and imitated by a passing poet.