The biggest disappointment… you. The whole way from Dorne all anyone talked about was the monster that had been born to Tywin Lannister. A head twice the size of his body, a tail between his legs, claws, one red eye, the privates of both a girl and a boy. When we met your sister, she promised she would show you to us. Everyday we would ask. Everyday she would say soon. Then she and your brother took us to your nursery and she unveiled the freak. Your head was a bit large. Your arms and legs were a bit small. But no claw, no red eye, no tail between your legs, just a tiny pink cock. We didn’t try to hide our disappointment. “That’s not a monster,” I told Cersei, “That’s just a baby.” And she said, “He killed my mother.” And she pinched your little cock so hard I thought she might pull it off until your brother made her stop. “It doesn’t matter,” she told us, “Everyone says he will die soon. I hope they are right. He should have not lived this long.” Oberyn Martell.
Tywin has made somewhat famous the saying "any man who must say 'I am the king' is no true king." Could you explain what he is supposed to mean by that. I can't really figure it out. I know it's Tywin and the cornerstone of his character is that he is full of shit, but I would still like to understand.