From a discussion with Geege:

http://pandawhale.com/post/41050/game-of-thrones-prequel-infographic-from-oberyns-dialogue-with-tyrion-season-4-episode-1

From "The Summer Man" -- season 4 (2010):

http://www.imdb.com/title/tt1615667/quotes

The full quote:

When a man walks into a room, he brings his whole life with him. He has a million reasons for being anywhere, just ask him. If you listen, he'll tell you how he got there. How he forgot where he was going, and that he woke up. If you listen, he'll tell you about the time he thought he was an angel or dreamt of being perfect. And then he'll smile with wisdom, content that he realized the world isn't perfect. We're flawed, because we want so much more. We're ruined, because we get these things, and wish for what we had.