A mere thought
In life, we often waste our energy worrying about things that might not even happen. We fill our head with negative thoughts that consume our mind and eventually gets us nowhere better than where we are right now. We're too busy with our thoughts that we forget to stop and take a step back, and look at what we've been through, what we've achieved. We get too focused on our wrongdoings instead of appreciating the good things within ourselves, then we tend to underestimate ourselves. Most of the time we do not realize the capabilities that lies beneath us.