"Laughter is wine for the soul — laughter soft, or loud and deep, tinged through with seriousness. Comedy and tragedy step through life together, arm in arm, all along, out along, down along lea. A laugh is a great natural stimulator, a pushful entry into life; and once we can laugh, we can live. It is the hilarious declaration made by man that life is worth living."
January 1, 1970
https://en.wikiquote.org/wiki/Se%C3%A1n_O'Casey