Answer:
I occur twice in eternity. And I'm always within sight.
My second is performed by my first, and it is thought a thief by the marks of my whole might be caught.
What has a head yet it never weeps, has a bed but never sleeps, can run but can not walks, and has a bank but not a cent to its name?
Before Google, we actually had to physically look things up in this building full of knowledge.
It goes up and down the stairs without moving.
What is always coming but never arrives?