But by doing yoga and other psychological therapy, your neurochemistry may be changed. That is how cognitive behavioural and mindfulness therapies work. I think in the end, your neurochemistry needs to be changed in order for the therapy to have an effect. But using drugs are not the only way to change your neurochemistry. In short, I don't think he is suggesting that the author of the article to use willpower. He simply suggests that maybe he can try some psychotherapy.