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If the practice is regularly made in a room, it is prudent to lock the door. During the early attempts to attain the first stage this may not be necessary; but during the later periods, when proficiency has been reached, it is necessary for self-protection. If a condition of deep self-absorption is present, and if another person were to burst into the room unexpectedly and abruptly, the nervous shock given would be severe.
-- Notebooks Category 4: Elementary Meditation > Chapter 1 : Preparatory > # 491