"We had some very important evidence here that suggested that the ability to work with sadness in people who had recover from depression may determine whether they're able to go on and sustain the benefits of treatment or whether they're going to relapse. But how do you work with a trigger of relapse like sadness when sadness is also a feature of our universal human experience? We weren't interested in trying to eliminate sadness. We weren't interested in trying to get people not to feel sad. What we really needed to do was help people develop a different relationship to their sadness. And what does that mean in terms of trying to teach people certain skills. This is really the point at which mindfulness comes into the picture."
Williams, J. M. G., Teasdale, J. D., Segal, Z. V., Kabat-Zinn, J., & Sounds True (Firm). (2007). The mindful way through depression: [freeing yourself from chronic unhappiness]. Boulder, CO: Sounds True. [Sounds True, library]