Bhagavad Gita, Zarathustra, Confucius

"How do these reflections on caste duties and detachment in the Bhagavad Gita compare and contrast with the moral and ethical teachings of Zarathustra and Confucius discussed in earlier chapters?"

Both Bhagavad Gita and Confucius's teachings focus on action. However, Bhagavad Gita specifically states, "Your business is with action alone, not by any means with the fruit of the action." This means not to care what comes out of your actions but to purely act. Confucius also teaches people to act. However, Confucius believes everyone should be good upright people. If an action led to death, Confucius would admonish the action.
Zarathustra does not focus so much on action. He focuses more on truth and goodness. So like Confucius, Zarathustra would admonish the act of fighting, because of its destructive nature.