The issue here is that the theory that predicts that CBT should be effective is called "Stoicism" and has been around for a long while prior to the concept of a psychological research process.

If you are looking for a therapy or action that arose from psychological theory directly, I would recommend looking into the treatment of PTSD (not even recognized as a treatable condition until the 1970s) or something-- CBT has been informed and refined by the research process, but its underpinnings existed prior to the research process itself.