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A Twofold Exercise: The inhaled breath is long and deep but not strained, while the exhaled breath is shorter. This allows some of the carbon dioxide to remain so that eventually a sleepy feeling is induced. The mind begins to retire into itself, the will slackens, the body relaxes. The other part of the exercise depends on whether you choose a chanted or whispered mantram or a pictured form, figure, scene, or diagram. The sound must be repeated constantly but slowly, the imagery must be held intensely.
-- Notebooks Category 4: Elementary Meditation > Chapter 2 : Place and Condition > # 257