As we know, all beings in this world have cravings, which in turn generate illimitable and immeasurable vexations. Most of our cravings are for physical gratification and can only be restrained if we remain contented. There is an old saying: "Contentment leads to ceaseless joy." This may sound simple, but is by no means easy to carry out. Yet, it is undeniable that whenever you feel contented, your mind will be free of vexations and attachments and will stay pure and unfettered.
~ Analects of Master Kuang-ch'in