The book of achievement of happiness, written by Al -Farabi and one of the most important writings of Al -Farabi and his works despite the suspicion of some in the title of the book, given that it did not come in the index of Al -Farabi's works contained in the index of Ibn Al -Nadim, a large volume divided by his writer into six chapters: In the first chapter, Al -Farabi meant to study the theore...