Life is made up of a series of choices, and we can choose to be happy with our work, consumption, temperance, or lack thereof. We can find balance or flow (Mihaly Czikszentmihalyi, 2004), or let our low moods bury us into a inward spiral of pessimism. As Csikszentmihalyi says,

Happiness is not a rigid state. Happiness takes a committed effort to be manifested.