Arjuna was not willing to fight to satisfy his senses. He thought that "If I do not kill my brother or nephews or my grandfather or my teacher, the other side, that will make me happy. If they are killed, then where is my happiness?"
This is material calculation, because he was giving more importance to the material body, what is his brother, what is his grandfather or teacher. He was seeing the material. Just like what is our calculation? I am thinking somebody my friend and another body as my enemy. Why? Because I make distinction on the bodily platform. I say: "American? Oh, they are my friends. Russians? They are my enemies." Why? What is the platform of this distinction? The platform is body. Because one has got the Russian body by some way or other, another bod . . . has got American body, I am making distinction. So this distinction is on the material platform. And the spiritual platform, there is no such distinction because it is simply spirit.