The Golden Sayings of Epictetus, with the Hymn of Cleanthes

I think I know now what I never knew before—the meaning of the common saying, A fool you can neither bend nor break. Pray heaven I may never have a wise fool for my friend! There is nothing more intractable.—“My resolve is fixed!”—Why so madman say too; but the more firmly they believe in their delusions, the more they stand in need of treatment.