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Works

Tusi has about 150 works, of which 25 are in Persian and the remaining are in Arabic, and there is one treatise in Persian, Arabic and Turkish.

An example from one of his poems:

Anyone who knows, and knows that he knows, makes the steed of intelligence leap over the vault of heaven. Anyone who does not know but knows that he does not know, can bring his lame little donkey to the destination nonetheless. Anyone who does not know, and does not know that he does not know, is stuck forever in double ignorance.