To be enthusiastic about doing much with human nature is a foolish business indeed; and, throwing himself into his work as he was doing, and expecting so much from it, would not the tide ebb as strongly as it was flowing? It is a rash game this setting our hearts on any future beyond what we have our own selves control over. Things do not walk as we settle with ourselves they ought to walk, and to hope is almost the correlative of to be disappointed.

Arthur's first summary - The Nemesis of Faith (1849)