Where we use words of a loose and wandering signification, hence follows mistake and error, which those maxims brought as proofs to establish propositions wherein the words stand for undetermined ideas, do by their authority confirm and rivet.
Every man who has seen the world knows that nothing is so useless as a general maxim. If it be very moral and very true, it may serve for a copy to a charity-boy. If, like those of Rochefoucault, it be sparkling and whimsical, it may make an excellent motto for an essay. But few indeed of the wise apothegms which have been uttered, from the time of the Seven Sages of Greece to that of Poor Richard, have prevented a single foolish action. We give the highest and the most peculiar praise to the precepts of Machiavelli when we say that they may frequently be of real use in regulating conduct, not so much because they are more just or more profound than those which might be culled from other authors, as because they can be more readily applied to the problems of real life.
Lord Thomas Babington Macaulay: Machiavelli, March, 1827.