This one is called "Beware the Ego"

In this world without meaning are those who pretend
that their lives and their deeds serve some grand cosmic end,
and that they are the center of all that exists
and the fate of the cosmos is right in their fists.

And to them we're not apes with less hair and big brains;
we're the center of everything there's to explain!
Not just masses of atoms traversing through space,
rather far grander things from a far grander place!

We're just specks on the earth which, I do believe,
is much larger than anything we can conceive,
and that planet's a speck to its star that's a speck
in a universe which is gigantic as heck!