We say, "In calmness there should be activity; in activity there should be calmness." Actually, they are the same thing; to say "calmness" or to say "activity" is just to express two different interpretations of one fact. There is harmony in our activity, and where there is harmony there is calmness. This harmony is the quality of being. But the quality of being is also nothing but its speedy activity.
~Shunryu Suzuki, in Zen Mind, Beginner's Mind