Watching my shadow as I ran grounded me, and I realized that feeling tired was more a mental fatigue than a physical one. If I could just quiet my mind, I wondered, would I still feel so tired? Sure, I slept only 4.5 hours. I could justify tiredness. But sure enough, as I followed my shadow and focused on my breath, I felt strength and endurance return, and I could keep running, and it felt pleasant. I seem to expect so much from my verbal mind, but there is a whole intelligence out there outside of it. Then I turned a corner and my shadow moved. You cannot follow your shadow forever, unless you never change direction.