" To conquer our insatiability, the Stoics advise us to engage in negative visualization. We should contemplate the impermanence of all things. We should imagine ourselves losing the things we most value, including possessions and loved ones. We should also imagine the loss of our own life. If we do this, we will come to appreciate the things we now have, and because we appreciate them, we will be less likely to form desires for other things. And besides simply imagining that things could be worse than they are, we should sometimes cause things to be worse than they would otherwise be; Seneca advises us to “practice poverty,” and Musonius advises us voluntarily to forgo opportunities for pleasure and comfort. • "

― William B. Irvine , A Guide to the Good Life: The Ancient Art of Stoic Joy