For example, there may be a certain kind of food that you enjoy very much, like a curry, for example, and you ask your cook to prepare a variety of dishes made with this curry. You sit down to eat, the meal is brought in and you are about to eat it with great relish. The moment you hear this and recognize the harmful nature of the food you were about to eat, you would under no circumstances consider eating it anymore, no matter how much you previously cherished that dish and looked forward to having it. In the same way, you have to recognize the nature of the things of the world. They are ever changing and some day they must cease to exist.
Food is only medicine for the disease called hunger.
Therefore, recognize the fact that the things you use in the world are only medicines for the diseases that you have. As the disease declines, the need for medicine diminishes. You cannot refuse to take the medicine just because it is not very tasty, while at the same time hoping to get cured. Now you are running after all sorts of attractive and tasty things which instead of curing your ills worsen them. You rejoice that you have discovered so many delights in the world and that you are living a very happy life, enjoying many things which seem to give you a lot of comfort and joy.