During zazen, brain and consciousness become pure. It's exactly like muddy water left to stand in a glass. Little by little, the sediment sinks to the bottom and the water becomes pure.
Taisen DeshimaruHarmonizing opposites by going back to their source is the distinctive quality of the Zen attitude, the Middle Way: embracing contradictions, making a synthesis of them, achieving balance.
Taisen Deshimaru