 A feature of the more recent collections is the lack of linguistic homogeneity and continuity of ideas.Sadegh Hedayat commented that "if a man had lived for a hundred years and had changed his religion, philosophy, and beliefs twice a day, he could scarcely have given expression to such a range of ideas".Hedayat's final verdict was that 14 quatrains could be attributed to Khayyam with certainty.