"I think my optimistic nature, my ability to shed trouble and to laugh through life, making "all my ducks swans," as friends say I do, must have been inherited from this delightful old masquerading grandfather whose name I am proud to bear. A sunny disposition is worth more than fortune. Young people should know that it can be cultivated; that the mind like the body can be moved from the shade into sunshine. Let us move it then. Laugh trouble away if possible, and one usually can if he be anything of a philosopher, provided that self-reproach comes not from his own wrongdoing."
January 1, 1970
https://en.wikiquote.org/wiki/Optimism