“But in another book by J. M. Barrie called The Little White Bird … he writes …” He started flipping through a small book on the podium until he found the page he was looking for, and then he put on his reading glasses. “ ‘Shall we make a new rule of life … always to try to be a little kinder than is necessary?’ ” Here Mr. Tushman looked up at the audience. “Kinder than is necessary,” he repeated. “What a marvelous line, isn’t it? Kinder than is necessary. Because it’s not enough to be kind. One should be kinder than needed.”