the goal of the Stoics was not to banish emotion from life but to banish negative emotions.
There was also agreement that one wonderful way to tame our tendency to always want more is to persuade ourselves to want the things we already have.
third and arguably much more important reason. We humans are unhappy in large part because we are insatiable; after working hard to get what we want, we routinely lose interest in the object of our desire. Rather than feeling satisfied, we feel a bit bored, and in response to this boredom, we go on to form new, even grander desires.
One key to happiness, then, is to forestall the adaptation process: We need to take steps to prevent ourselves from taking for granted, once we get them, the things we worked so hard to get.