Originally Posted by Bane Cook
"But I never escaped."
Anyone think this has a double meaning? Even after being rescued from the pit, he's still trapped there. The mask is a constant reminder that he carries around with him.
You are right, Bane had hard time believing that Bruce could escape from the pit, that was why Bane said "Impossible" when he saw the burning Bat symbol on the bridge.
To Bane not being able to escape from the pit was a reminder that he could never let go of his past and become normal, also the fact that Bruce could do it despite having a broken back (and his broken will) was an indicator of Bruce's mental and physical superiority over Bane.