Droll yet poignant, this line uttered by Mr. Dumby, a character created by Oscar Wilde for his 1892 play “Lady Windermere’s Fan,” expresses the value of learning from our errors. Remembered for his witty epigraphs as much as his groundbreaking satirical works, Wilde wrote of the follies and foibles of the upper class in Victorian England, and often brought his characters redemption through a hard-earned lesson. The Irish playwright reminds us that we all mess up from time to time, but we can extract valuable wisdom from those mistakes.