power of observation+listening.
Living through our own experience – absorbing the world and people around us as we participate in activities is the best way to learn and assimilate learnings. What cements this is reflection. The more we reflect on what experience teaches us, the better we learn. When we fail to do that, we do not absorb new learnings, and hence repeat mistakes. On the other hand, those who deliberate on experiences, are the ones who add confidence and intent to every step of their lives, continuously upgrading their existence.