Other dialouge we can play around with:
"You lack the will to do what us necesarry."
"Your anger gives you great power, but if you let it, it will destroy you."
"Vengeance."
"Justice is balance."
"I warned you about compassion, Bruce."
"We can teach you how to dissapear."
"Yes but is Ra's A Ghul Immortal? Are his methods, supernatural?"
There are many more I'm sure, I can't think of ALL of them right now; Neeson's character was much like a dark Qui-Gon.
Kingdom of Heaven would also be a goos source.