Most people spend most of their time thinking about the past or the future. I've been guilty of that, too. After reading Eckhart Tolle's The Power of Now few months ago I have been recalibrating myself. Tolle writes that happiness can be found only when your whole attention is in the present moment, outside your head. He also writes about the pain-body that feeds off negative feelings, and if you're in the now, you don't have negative feelings. My goal is to be in the now most of the time.