Study has always been for me the sovereign remedy against life’s unpleasantness, since I have never experienced any sorrow that an hour’s reading did not eliminate.

[L’étude a été pour moi le souverain remède contre les dégoûts de la vie, n’ayant jamais eu de chagrin qu’une heure de lecture n’ait dissipé.]

Charles-Lewis de Secondat, Baron de Montesquieu (1689-1755) French political philosopher

Pensées [Thoughts], # 213 (1720-1755) [tr. Clark (2012)]
    (Source)

(Source (French)). Alternate translations:

Study has been my sovereign remedy against the worries of life. I have never had a care that an hour's reading could not dispel.
[Source (1826)]

Study is a sovereign remedy against the troubles of life; there is no vexation which an hour's reading cannot mitigate.
[E.g. (1877)]

Study has been to me a sovereign remedy against the vexations of life, having never had an annoyance that one hour's reading did not dissipate.
[E.g. (1905)]

Study has been my sovereign remedy against life's disappointment; I have never known any distress that an hour's reading did not relieve.
[ed. Guterman (1963)]