Whatever you do, don't harp on the past . Reminiscing is good, but only up to a point. If you find yourself stuck in the past rather than focusing on present and future goals, you're only inhibiting your growth.  Sure, we all have moments where we reflect on happier times in our life and say, "I almost miss those days." But we are prone to such thinking when faced with challenges in the present that drag us down. But why not tweak your thinking and reason that once you surmount those challenges, you'll be even happier -- and feel more accomplished -- than you did in the past? Then there are those of us who ruminate on bad experiences in the past -- a close friend inexplicably stabbing us in the back, a significant other we envisioned ourselves being with our whole lives suddenly proclaiming their need for space and effectively ending the relationship, an outstanding job opportunity that slipped through our fingers. But brooding over the past i...