“Bodily exercise, when compulsory, does no harm to the body; but knowledge which is acquired under compulsion obtains no hold on the mind.”
Help us to complete the source, original and additional information
Plato 80
Classical Greek philosopher -427–-347 BCRelated quotes

Women Saints of East and West

“Reading is to the mind, what exercise is to the body.”
No. 147.
The Tatler (1711–1714)
Variant: A good conscience is to the soul what health is to the body
Context: 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.

“Reading is to the mind what exercise is to the body.”
Tatler (1709-1711), no. 147

Small Catechism http://www.ccel.org/ccel/luther/smallcat.text.i.5.html|The, The Fifth Commandment, (1529)

“Every other knowledge is harmful to him who does not have knowledge of goodness.”
Book I, Ch. 25
Essais (1595), Book I
Source: The Complete Essays

Source: Aphorisms and Reflections (1901), p. 239