The meaning was that roughly two thirds of world's classic literature is about how people are capable to alter their life circumstances and conditioning. There

The meaning was that roughly two thirds of world's classic literature is about how people are capable to alter their life circumstances and conditioning. There might be a legitimate question of which particular CBT is more efficient, but there is no question of whether or not it works. Smart people usually bootstraping individual CBTs for themselves. Some, like Hermann Hesse, even wrote books about it.