Past, Present, Past

What is it about the past that makes us its slave? Good or bad, we keep going back to it, play it again and again in our heads, smile or cry, and refuse to move on. Sure, some of us are naive enough to claim otherwise, but everyone holds on to past for its mere presence. We all might not be bunch of great futurists, but we all are intelligent past observers. Naive, intelligent, and very very human.