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If Nature be not improved by instruction, it is blind; if instruction be not assisted by Nature, it is maimed; and if exercise fail of the assistance of both, it is imperfect.

Plutarch (1871). “Plutarch's Morals”, p.5
If Nature be not improved by instruction, it is blind; if instruction be not assisted by Nature, it is maimed; and if exercise fail of the assistance of both, it is imperfect.