In other words, it must be used in order that it may become strong, active, and healthy. It must be educated, not necessarily educated in the sense we call schooling, but educated by the mental activity that observes things, studies the form, purpose, and effect of them, and reasons the consequences that may arise from any action. Men are foolish who think they can deaden the brain with liquor, stupefy it with drugs, and poison the system with nicotine and yet have a good memory. If any there be who have accompanied us thus far on our journey who think they can persist in dissipation and at the same time acquire a good memory, they had better stop right where they are and not hug that flattering unction to their souls. Note the words that Shakespeare puts in the mouth of Lady Macbeth:
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