Learning to stay in an asana for an extended period of time is a powerful and important practice. Working with ones's edge and extending one's capacities little by little, with awareness and sensitivity, can be empowering and enlightening. Sometimes we need to stay long enough for the inner light of our own awareness to burn away what might feel like layers upon layers of physical or conceptual obstruction. Sometimes we need to go out into the sun, look at a lamp, or into another person for light and inspiration—if only to ignite, or remind us of our own inner light, life energy, and capacity for illumination. Light is energy. Why we seek it and where we find it, how we use or inhabit it, are questions worth living.
I was recently asked the following question: "Can you describe the hardest yoga class that you have ever taken?" Or something like that. It was interesting to sit with this question.