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Reading is to the mind, what exercise is to the body. As by the one, health is preserved, strengthened, and invigorated: by the other, virtue (which is the health of the mind) is kept alive, cherished, and confirmed.

Sir Richard Steele, Joseph Addison (1785). “The Tatler: Or, Lucubrations of Isaac Bickerstaff, Esq”, p.371
Reading is to the mind, what exercise is to the body. As by the one, health is preserved, strengthened, and invigorated: by the other, virtue (which is the health of the mind) is kept alive, cherished, and confirmed.