“Beware the anger of a patient man.”
Source: Cross
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James Patterson 342
American author 1947Related quotes

“Beware the fury of a patient man.”
Pt. I, line 999–1005. Compare Publius Syrus, Maxim 289, "Furor fit læsa sæpius patientia" ("An over-taxed patience gives way to fierce anger").
Absalom and Achitophel (1681)
Variant: Beware the Fury of a Patient Man.
Context: Oh that my Pow'r to Saving were confin’d:
Why am I forc’d, like Heav’n, against my mind,
To make Examples of another Kind?
Must I at length the Sword of Justice draw?
Oh curst Effects of necessary Law!
How ill my Fear they by my Mercy scan,
Beware the Fury of a Patient Man.

“Beware the wrath of a patient adversary.”
This has recently become attributed to Calhoun on the internet and in print, but seems to be a derivative of John Dryden's statement in Absalom and Achitophel (1681): Beware the Fury of a Patient Man.
Disputed

“If you are patient in one moment of anger, you will escape a hundred days of sorrow”

“Beware the man of a single book.”
Hominem unius libri timeo. / Timeo hominem unius libri.
As quoted by Leonard Sweet, The Greatest Story Never Told http://books.google.gr/books?id=KuTRcjWL91AC&dq=, section: "The Gift of Lyrics", Abingdon Press, 2012
Variant: "Beware the man of one book."
See also: Homo unius libri
Disputed
Variant: I fear the man of a single book.

“Beware of the man whose god is in the skies.”
#83
1900s, Maxims for Revolutionists (1903)
“Beware of the man who won't be bothered with details.”
As quoted in Good Advice (1993), edited by William Safire and Leonard Safir, p. 215

“977. Beware of no Man more than thy self.”
Introductio ad prudentiam: Part II (1727), Gnomologia (1732)