The words Carlyle put in italics are a quotation from Book 1 of Aristotle's Nicomachean Ethics.
More quotes by Thomas Carlyle
Speech is human, silence is divine, yet also brutish and dead: therefore we must learn both arts.
No sadder proof can be given by a man of his own littleness than disbelief in great men.
The great law of culture is: Let each become all that he was created capable of being.
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Attribution
Quote text and notes from Wikiquote: Thomas Carlyle (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.