“"Beware Okonkwo!" she warned. "Beware of exchanging words with Agbala. Does a man speak when a god speaks? Beware!"”
Source: Things Fall Apart (1958), Chapter 11 (p. 95)
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Chinua Achebe 63
Nigerian novelist, poet, professor, and critic 1930–2013Related quotes

“Beware of the man whose god is in the skies.”
#83
1900s, Maxims for Revolutionists (1903)

“Beware when the great God lets loose a thinker on this planet.”
1840s, Essays: First Series (1841), Circles

“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 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 when making a woman cry. God is counting her tears.”
Source: Adultery
“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