126. The development of samadhi power is only one aspect of our practice of zazen. Another, and equally important aspect, is that of 'letting-be'. This practice of 'letting-be' is facilitated by the related practices of 'letting-go' and 'being-with' in the act of 'just-sitting'. The technical term for 'just-sitting' is shikantaza. The 13th century Japanese master Dogen was the great champion and exponent of shikantaza. He wrote: 'Sit solidly in Samadhi and think not-thinking. How do you think not-thinking? Non-thinking. This is the art of zazen .... It is the dharma gate of great ease and joy. It is undefiled practice-enlightenment'.