When I first started martial arts it was in this Shotokon dojo in Williamsburg, Brooklyn. I didn't stay there long, but I learned some valuable lessons there. One time Shihan had us stand in a rooted stance with one arm held out strong. He called students up to demonstrate. When the first student came up Shihan pushed his arm down showing that he wasn't strong enough. When the second student came up. Shihan pushed his arm to the side.
I thought to myself that these students were weak and I was strong. If Shihan called me up I would show everyone how it was done.
Then Shihan called me up. I thought he could see the confidence on my face and wanted someone to demonstrate for the class. I was strong and determined. Shihan instructed me to demonstrate. I confidently took the center of the floor. Shihan noted to the class how strong my stance was. Slowly he came at me to demonstrate how rooted and firm I was. Then at the last minute he stepped to the side without touching me and I toppled forward.