Hershel and Glenn confer in this scene from The Walking Dead. It is from the episode "Internment."
Added:
Hershel Greene has a whole lot to think about on The Walking Dead Season 4. This is a scene from Episode 5.
Added:

The Walking Dead Season 4 Episode 5 Quotes

Carl: Dad, you can’t keep me from it.
Rick: From what?
Carl: From what always happens.
Rick: Yeah. Maybe. But I think it’s my job to try.

I still think there’s a plan. I still believe there’s a reason.

Hershel