“What a man has, so much he is sure of.”
Variant: What a man has, so much he is sure of.
Source: Don Quixote de la Mancha (1605–1615), Part II (1615), Book III, Ch. 43.
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Miguel de Cervantes 178
Spanish novelist, poet, and playwright 1547–1616Related quotes

Jämmerlich ist freilich jene praktische Philosophie der Franzosen und Engländer, von denen man meint, sie wüßten so gut, was der Mensch sei, unerachtet sie nicht darüber spekulierten, was er sein solle.
Cited in Lucinde and the Fragments, P. Firchow, trans. (1991), "Athenaeum Fragments" (1798), § 355.

Source: The Doctrine of the Mean

General sources
Context: Permit me, sir, to give you one piece of advice. Be not so positive; especially with regard to things which are neither easy nor necessary to be determined. When I was young I was sure of everything. In a few years, having been mistaken a thousand times, I was not half so sure of most things as I was before. At present, I am hardly sure of anything but what God has revealed to man.
Reply to a letter signed "Philosophaster" addressed to him in the London Magazine of 1774, in London Magazine 1775, p. 26

“So much is a man worth as he esteems himself.”
Source: Gargantua and Pantagruel (1532–1564), Pantagruel (1532), Chapter 29 : How Pantagruel discomfited the three hundred Giants armed with free-stone, and Loupgarou their Captain (Loup-garou is the french term for werewolf).

“No man needs a vacation so much as the man who has just had one.”

To Leon Goldensohn, May 24, 1946, from "The Nuremberg Interviews" by Leon Goldensohn, Robert Gellately - History - 2004 - Page 71