"While doing centering prayer, the practice is to let go of any thought or perception. The priority is to be as silent as possible and when that is not possible to let the noise of the thoughts be the sacred symbol for a while, without analyzing them."

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One day, when I was doing well in class and had finished my lessons, I was sitting there trying to analyze the game of tic-tac-toe... The teacher came along and snatched my papers on which I had been doodling... She did not realize that analyzing tic-tac-toe can lead into dozens of non-trivial mathematical questions.

— Martin Gardner