Albert Ellis popularised the Stoics. He created a new pharmaceutical therapy that he called rational or motive behaviour therapy, which is one of the inspirations for what we now call cognitive behavioural therapy or CBT. The job of an evidence based psych therapist is to take complicated research and translate it into language that people can understand. And so by the time I started training in CBT, it was a cliche to say it's not things that are set as, but rather our opinions about them.