Think about how quickly everything dissolves and breaks down. Bodies and substances return to the basic matter of the world. Their memories fade into the flow of time. Think about the nature of all the things you can see and touch in this world. Especially those that trap you with pleasure, or frighten you with pain, or dazzle you with their shine and status. See how cheap and worthless they really are. How low and rotting. How empty of real life and meaning.
Consider how quickly all things are dissolved and resolved: the bodies and substances themselves, into the matter and substance of the world: and their memories into the general age and time of the world. Consider the nature of all worldly sensible things; of those especially, which either ensnare by pleasure, or for their irksomeness are dreadful, or for their outward lustre and show are in great esteem and request, how vile and contemptible, how base and corruptible, how destitute of all true life and being they are.