If We Are Not Stupid Or Insincere When We Say That The Good Or Ill
Of Man Lies Within His Own Will, And That All Beside Is Nothing To
Us, Why Are We Still Troubled?
If we are not stupid or insincere when we say that the good or ill
of man lies within his own will, and that all beside is nothing to
us, why are we still troubled?
-- Epictetus (c. 60 AD)
-- Discourses, Book i, Chap. xxv