I did not know Holbrooke that well. Then again, I wonder if I ever could know someone as peripatetic as he was. Holbrooke was a political and diplomatic Great White Shark. Intellectually powerful, scaldingly opinionated, indefatigable.
A chief lesson all diplomats need to learn from Holbrooke is that diplomats have a higher calling than just representing the "national interest." They should think fundamentally about the end-state -- helping others help themselves.