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It is easy to have calmness in inactivity, it is hard to have calmness in activity, but calmness in activity is true calmness.

Shunryu Suzuki (2010). “Zen Mind, Beginner's Mind”, p.31, Shambhala Publications
It is easy to have calmness in inactivity, it is hard to have calmness in activity, but calmness in activity is true calmness.