Not at all astonishing. :-) Modern cognitive behavioral therapy (CBT) originates[1] from the 2000-year-old work of Epictetus. Cicero memorably called philosophy as "the medicine of the mind". Going back to Socrates and Epictetus, philosophy was "a way of life", and not tying clever knots in thin air and untying them.
[1] https://en.wikipedia.org/wiki/Rational_emotive_behavior_ther...