। ॥ १८ ॥
In plain words
In exactly the same way, this whole world is passing — because it is Brahman's effect. And its cause, Brahman, the supreme, must be eternal: like clay, like all such causes.
Close to the Sanskrit
In just that same way, this entire world is impermanent, because it is an effect of Brahman; its cause, the supreme Brahman, must be eternal, like clay and the rest.