From Self-Development and the Way to Power, by L. W. Rogers (27)

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Another method that goes admirably with such work is the close
observation and study of all the life in manifestation about us. We
should try to comprehend people, to observe and understand them. Every
word, act and facial expression has its meaning to be caught and
interpreted. All this will not only sharpen the wits but also
strengthen human sympathy for it enables us the better to know the
difficulties and sorrows of others. If such practices are followed
faithfully day by day the growth will be steady.