If one could keep as happy as a child or a dog, it would be by being as innocent as a child, or as sinless as a dog.
若有人能像孩子或小狗一样始终快乐,那一定是因为他像孩子一样纯真,或像小狗一样无罪。
— G. K. Chesterton · Manalive · Part II · IV · The Wild Weddings; or, the Polygamy Charge —