Bayakua has some of the best quotes in the series besides aizen:
(To Renji) "Shall I tell you the difference between you and I? It's level. It's like the story of the monkey trying to capture the moon. No matter how he struggles, it's just the moon's reflection on the water he sees. So he only sinks into the water. Time after time, he sinks."
(To Zommari Leroux) "I have already told you. You and I, our levels are as distant as the earth from the heavens. Must I spell it out for you? I have discarded my left arm, discarded my left leg, and yet even so, I have not nearly lowered myself to your level."
(To Zommari) "At what point did I ever claim that I was cutting you down in my capacity as a Shinigami? To justify the actions I have taken I need but one reason. You raised your blade in contempt of my pride.
Arrogance is often the undoing of a would-be victor” – Kuchiki Byakuya