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- The great problem of the shifting relation between passion and duty is clear to no man who is capable of apprehending it; the question whether the moment has come in which a man has fallen below the possibility of a renunciation that will carry any efficacy, and must accept the sway of a passion against which he had struggled as a trespass, is one for which we have no master-key that will fit all cases.7.2 -- Book 7 Chapter 2 -- St. Ogg's Passes Judgment (93% in)
There are no more uses of "efficacy" in The Mill on the Floss.
Typical Usage (best examples)