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Hope itself is a species of happiness, and, perhaps, the chief happiness which this world affords; but, like all other pleasures immoderately enjoyed, the excesses of hope must be expiated by pain.

James Boswell, Samuel Johnson (1799). “Boswell's Life of Johnson: Including Boswell's Journal of a Tour of the Hebrides, and Johnson's Diary of A Journey Into North Wales”, p.426
Hope itself is a species of happiness, and, perhaps, the chief happiness which this world affords; but, like all other pleasures immoderately enjoyed, the excesses of hope must be expiated by pain.