In this episode, Dr. Killeen reflects on a simple idea from Epictetus that carries lasting impact: we cannot learn what we think we already know. When we assume we have the answers, we stop asking questions and our growth begins to stall. True progress comes from staying open, curious, and willing to challenge what we think we understand. In dentistry, the most effective clinicians and leaders embrace this mindset. They continue learning, seek input from others, and recognize that confidence without humility can lead them in the wrong direction. By staying curious and acknowledging what we do not know, we keep improving and avoid becoming stagnant.