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1.
S₁: When you leave your house, concentrate your mind on a subject.
S₆: It is idle to pretend that your mind is incapable of concentration.

P: Bring the mind back by the scruff of the neck.
Q: You can not by any chance fail if you persevere.
R: Before you have reached the station you will have brought it back about 40 times.
S: You will not have gone ten yards before your mind has skipped away under your very eyes and is playing round the corner with another subject.