The practical application of this tenet of stoicism has a lot of merit. understand that you do not control whether or not you get the things you want, or if you do get them, when you will lose them. With that understanding, cherish it. Appreciate it. Do not take it for granted. Treat it as if it were going to be lost to morrow. And while you are doing this, prepare yourself mentally to cope with the loss by knowing that after it happens, you are going to continue to live.