Battle, Rebirth, and Immortality

According to the Bhagavad Gita, the mortal body is everlasting. So wouldn't that mean it's immortal? Not exactly. Unlike the teaching of Zarathustra, which relfects upon the belief that doing good deeds in life will win you immortality, the Bhagavad Gita teahces that you will continue to be reborn. One will go into new bodies almost in the same sense that one changes clothes. One does not go to a heaven or paradise to live as an immortal, but one's "lives" never end. Additionlly, the Bhagavad Gita repetitively refers to a "righteous battle" where it does not matter whether one wins or loses; if you win you continue living your current life, if you die you begin a new one. It teachs that it is your actions themselves that matter, not the means behind them. This is different from Confucius teachings, believing that people can always improve based on their motives in life. To use a modern example, according to the Bhagavad Gita, if you were to find return a lost cat to its owner, the fact that you did this is all that matters. It doesn't matter whether you did this simply out of the goodness of your heart or your selfish desire for the cash reward, which is what Confucius teachings are concerned with.