George R. R. Martin
A Clash of Kings - Catelyn VII - “A Golden Sword” Speech
Jaime gave a shrug. "If truth be told, it was your son that I was trying to slay. The others got in my way. I killed them in fair fight, in the heat of battle. Any other knight would have done the same."
"How can you still count yourself a knight, when you have forsaken every vow you ever swore?"
Jaime reached for the flagon to refill his cup. "So many vows . . . they make you swear and swear. Defend the king. Obey the king. Keep his secrets. Do his bidding. Your life for his. But obey your father. Love your sister. Protect the innocent. Defend the weak. Respect the gods. Obey the laws. It's too much. No matter what you do, you're forsaking one vow or the other." He took a healthy swallow of wine and closed his eyes for an instant, leaning his head back against the patch of nitre on the wall. "I was the youngest man ever to wear the white cloak."
"And the youngest to betray all it stood for, Kingslayer."
"Kingslayer," he pronounced carefully. "And such a king he was!" He lifted his cup. "To Aerys Targaryen, the Second of His Name, Lord of the Seven Kingdoms and Protector of the Realm. And to the sword that opened his throat. A golden sword, don't you know. Until his blood ran red down the blade. Those are the Lannister colors, red and gold."