Epictetus. (c.A.D. 50–c.A.D. 138). The Golden Sayings of Epictetus.
The Harvard Classics. 1909–14.
LXIX
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 madmen say too; but the more firmly they believe in their delusions, the more they stand in need of treatment.