"A Zen student asked his roshi the most important element of Zen.The roshi replied, "Attention." "Yes, thank you," the student replied. "But can you tell me the second most important element?"And the roshi replied, "Attention.""

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People habituate themselves to let things pass through their minds, as one may speak, rather than to think of them. Thus by use they become satisfied merely with seeing what is said, without going any further. Review and attention, and even forming a judgment, becomes fatigue; and to lay anything before them that requires it, is putting them quite out of their way.

— Joseph Butler