Babylon 5, Season 4: No Surrender, No Retreat

[Delenn meets with Neroon to discuss their castes' open war.]

Delenn:
Yes, we've disagreed, even fought, but I would rather have someone who opposed me out of an honest belief in the rightness of his cause than someone who is always on my side because it was expected and required.

[Sheridan is speaking with the Drazi ambassador about White Star ships on the borders of Centauri and Narn space.]

Sheridan:
I can't confirm that.

Drazi Ambassador:
But you're not denying it either.

Sheridan:
But not denying it doesn't make it true any more than not confirming it makes it false. - Are you with me so far?

Drazi Ambassador:
I'm not sure.

Sheridan:
Ambassador, there are so many things in the universe that are and so many things that aren't. If I were to take the time to deny all the things that aren't, we'd be here for centuries, wouldn't we?