Source, in full
Canto III, line 547. Sometimes misreported as "is convinced" instead of "complies"; reported in Paul F. Boller, Jr., and John George, They Never Said It: A Book of Fake Quotes, Misquotes, & Misleading Attributions (1989), p. 11
More quotes by Samuel Butler
Love is a boy by poets styl'd;
Then spare the rod and spoil the child.
Doubtless the pleasure is as great
Of being cheated as to cheat.
As men of inward light are wont
To turn their optics in upon 't.
For those that fly may fight again,
Which he can never do that's slain.
Have always been at daggers-drawing,
And one another clapper-clawing.
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Attempt the end, and never stand to doubt;
Nothing's so hard but search will find it out.
All theory is against the freedom of the will; all experience for it.
Attribution
Quote text and notes from Wikiquote: Samuel Butler (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.