Effort is the gist of it. There is no happiness except as we take on life-engaging difficulties. Short of the impossible, as Yeats put it, the satisfaction we get from a lifetime depends on how high we choose our difficulties. Robert Frost was thinking in something like the same terms when he spoke of “The pleasure of taking pains”. The mortal flaw in the advertised version of happiness is in the fact that it purports to be effortless.