His "MU" was a blow aimed at breaking or untying the attachment even at the teaching itself; the essence is non-attachment. All human troubles and sufferings, without exception, are due to attachment. Even attachment to the idea of non-attachment is the attachment. It transcends the relative world and gains the free and independent world of satori.
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Our life is always attached to the relative: the "is" and the "is not," "good" and "bad," "right" and "wrong". But life itself constantly changing: the condition of society changes, right and wrong changes. Every situation is different according to the time and place. Static concepts are not appropriate to life, but the concepts like faith, hope, and love are; because they grow and evolve.