The exchange above is repeated countless times this season, and usually follows a torture, beating, shooting, chase, betrayal, or broken heart. It's pretty lazy dialogue for such a sharp series and typical of a season that is a huge disappointment after the excellent Season 5.
Jack Bauer is released after 20 months of torture in a Chinese prison; though he can barely stand, within moments he's fighting bad guys, jumping fences, and single-handedly bringing down all his enemies. This season, the "hostiles" are Arabs, Chinese, and Russians, as well as some Washington insiders who bicker like children. Since half of the story takes place in the White House, we see much less of Jack, and the show suffers in his absence.
The writers have come up with an endless parade of forgettable villains whose only purpose is to pad the story. When Jack's on the screen, the show is brilliant, thanks to Keifer Sutherland; when he's gone, it's tedious.