Mental power

Orson: I've been doing a lot of thinking lately and I've decided finally to be happy.

Bree: How can you just decide something like that?

Orson: Look, there are things that I don't like about my life, but there is so much that is good. [...] I mean, if I can decide to be resentful and jealous I can damn well decide to be happy.*

Desperate Housewives, Season 5 Ep. 20