Tyrion and Tywin talk about the key to the north

In this video Tyrion is trying very hard to prove a point, a point which Tywin sincerely denies him. Endless complaining and wailing lay before Tyrion as he approaches Tywin with his ultimate goal. How will he prevail through these dark times? The conversation with his father reveals many dark things that can be either good or bad depending on who you are and what you Believe. Now what do I mean by this text? See for yourself.