“Moderation in temper, is always a virtue; but moderation in principle, is a species of vice.”
Thomas Paine (1737–1809) English and American political activist
1790s, Letter to the Addressers (1792)
Context: A thing, moderately good, is not so good as it ought to be. Moderation in temper, is always a virtue; but moderation in principle, is a species of vice.