[Duchess] “Ah! Lord Henry, I wish you would tell me how to become young again.” [Lord Henry] “Can you remember any great error that you committed in your early days, Duchess?” [Duchess] “A great many, I fear.” [Lord Henry] “Then commit them over again,” “To get back one's youth, one has merely to repeat one's follies." [Duchess] "what a delightful theory!" [Sir Thomas] "A dangerous theory," "That is one of the great secrets of life. Nowadays most people die of a sort of creeping common sense," "and discover when it's too late that the only things one never regrets are one's mistake"