It is good for us to have sometimes troubles and adversities: for they make
a man enter into himself, that he may know that he is in a state of banishment,
and may not place his hopes in anything of this world.
God gave us the good things of the world to enjoy, but ultimately they're not what we're here for. All of the things we spend our time and energy on--jobs, homes, possessions, hobbies--can all be taken from us in a matter of moments or days. Even our loved ones can be snatched from us, though their immortal souls live on. As the whiskey priest in The Power and the Glory realized nearing death, in the end nothing matters but being a saint.
I'm going to try to remember this more often.