Elizabeth Von Arnim said this quote

Such a little difference in Susie's ways and ideas would make them all so happy; such a little change in Peter's habits would make his wife's life radiant. But they all lived blindly, on, each day a day of emptiness, each of those precious days, so crowded with opportunities, and possibilities, and unheeded blessings, and presently life would be behind them, and their chances gone for ever.