Nature cannot be profitably studied alone through books.
Nature has a separate message for each intelligence.
Each body machine has peculiarities which the possessor alone can
understand.
Object lessons, personally experienced or observed, are the best.
"Once seeing (or feeling) is worth an hundred times telling about," is
a wise Japanese proverb; and it is true.
As the swinging pendulum taught Galileo, and the falling apple
suggested to Sir Isaac Newton, the law of gravity, in like manner the
modern electric power-plant teaches us, by analogies, suggestions
useful in the study of ourselves--our own Mind Power-Plant.