This is a ground-breaking look at the fascinating dialogue between modern cognitive therapy and ancient Greek philosophy.
The relationship between Stoicism and CBT has been briefly discussed by some - including by the founders of CBT - but this is the first time a book has been written on the philosophical roots of the therapy.
CBT is not the same as Stoicism - there are important differences, as Robertson recounts. But CBT has taken from ancient Greek philosophy not just their cognitive theory of emotions (the idea that our emotions follow our thoughts or beliefs about the world) but also many of their therapeutic techniques, such as the thought journal, training one's attention to the present moment, and the 'Socratic method' of subjecting one's beliefs to rational scrutiny.
Robertson is particularly good at describing the practical therapeutic techniques the Stoics had in their armoury - including some powerful techniques that modern psychotherapy has yet to really exploit, such as the View From Above visualisation technique.
Of course, there are differences between psychology and moral philosophy - their aims, their methods, their context, their professional qualifications. For example, the aim of therapy is 'feeling good', while the aim of Stoicism was more explicitly moral.
But there is a rich dialogue to be had between the two, if both sides have the openness and willingness to talk. Robertson is to be applauded for advancing this dialogue, and transforming our idea both of philosophy, and of psychotherapy.