Well, the short answer is that we have huge volumes of evidence on the effects of training in CBT…

Well, the short answer is that we have huge volumes of evidence on the effects of training in CBT, which is based on a premise derived from Stoicism, as discussed in this article. So arguably that provides at least some indirect evidence of the general feasibility of training in Stoicism. We also have several studies conducted by Modern Stoicism from which data have been published showing the effects of training in Stoicism to be of benefit to the majority of participants.