DAVID: [i]You can have your picket fence[/i].

ROMANSH: [i]Oh no the metaphor is all wrong … agnostics are digging in the dirt looking for answers. It is those who think they have come to answer are sitting on their fences, thinking they can see further.[/i]

"To sit on the fence": to avoid saying which side of an argument you support (Longman). Perhaps an example of you trying to change the normal definition of an expression? Oh, perish the thought! ;-) (I'm only teasing.)