Our egos are always trying to find happiness where [it] can't be found. One can't find true, lasting happiness outside of themselves. Whatever happiness you find outside of yourself, can be taken away. And in time, it will be taken away, because the nature of everything that exists, everything you can observe, everything that is around you, is that it is impermanent.

The Basic Teachings - Part 1: Principles of the Teaching (2009)