The body here is the chariot, this life – the battle-ground (Kurukshetra), the soul that turns a seeker of higher wisdom is Arjuna. Each birth is a soul’s entry into this battleground, to help emerge its own dharma (virtues) and to destroy adharma (ego).
But only a soul that turns a seeker (Arjuna), regardless of its form identified caste, creed, religion etc. gets to understand the true purpose of life. And with this understanding comes the realization that the war cannot be won alone.
So, it seeks refuge in higher wisdom (Krishna) and from there it gets the power and the insight into ways that can restore its own dharma.
The wisdom though is as vast as the ocean. It comes from many sources (avatars/forms). But its origin is one. Its purpose one. Its essence one.