“As art is a habit with reference to things to be done, so is science a habit in respect to things to be known.”
Introduction.
De Generatione Animalium (1651)
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William Harvey 8
English physician 1578–1657Related quotes

“Habit makes all things bearable.”
Quod male fers, adsuesce, feres bene.
Book II, line 647 (tr. James Michie)
Ars Amatoria (The Art of Love)

“Man is made of ordinary things, and habit is his nurse.”
Act I, sc. iv
Wallenstein (1798), Part II - Wallensteins Tod (The Death of Wallenstein)

“Make it your habit not to be critical about small things.”

“As to diseases, make a habit of two things — to help, or at least, to do no harm.”
Epidemics, Book I, Ch. 2, Full text online at Wikisource
Variant translation: The physician must be able to tell the antecedents, know the present, and foretell the future — must mediate these things, and have two special objects in view with regard to disease, namely, to do good or to do no harm.
Paraphrased variants:
Wherever a doctor cannot do good, he must be kept from doing harm.
Viking Book of Aphorisms : A Personal Selection (1988) by W. H. Auden and Louis Kronenberger, p. 213.

“Marriage is a very good thing, but I think it's a mistake to make a habit out of it.”
'"The Treasure"
Short Stories