"I likely won't be as kind as you deserve either." Because there will be times he loses control, lets the rage he carries speak in ways that may or may not be warranted and his expression twists slightly.

"Self control isn't exactly my best feature, Wen-guniang, and my temper tends to get the best of me at times." Especially when it came to certain matters, but he's trying to rein it in here.

Because it serves no good for him to have that little control. His position here isn't as secure as the one he held at home, after all.