You should not fall into the habit of overvaluing external things and becoming overly attached to them. You can check this, he says, by asking yourself whether you would be upset if the things you value were ever taken away. The Stoics wanted to develop a healthy sense of gratitude in life, unspoiled by attachment. So they practiced calmly imagining change and loss, like a river gently flowing past, carrying things away. The wise man loves life and is grateful for the opportunities it gives him, but he accepts that everything changes and nothing lasts forever.
