I once participated in a technical training course instructed by a woman who started the class by saying she hoped there were some mistakes and misunderstandings during the day. “Those,” she brightly announced, “are learning opportunities!”
At several points during the training, we were split into groups to perform group exercises. Our instructor then wandered throughout the room and visited with each group to check progress. I still recall her declaring: “Very good! A learning opportunity!” when she needed to place a group back on track.
The best lesson from that day was leaning to accept and appreciate our mistakes.