See also: Homo unius libri
"Beware the man of one book."
More quotes by Thomas Aquinas
Charity, by which God and neighbor are loved, is the most perfect friendship.
It must be said that charity can, in no way, exist along with mortal sin.
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Attribution
Quote text and notes from Wikiquote: Thomas Aquinas (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.