Try to understand the distinction between material and spiritual. Material means I have to act. Acting means I have to act with my senses, with my desires, with my thinking, feeling, willing, so many things, because that is original. You cannot stop your thinking, feeling, willing, working, because that is your original nature. You are living entity. If you have no thinking, feeling, willing, desire or working, then what is the difference between you and the stone? You are not stone. Some philosopher are trying to make you stone, but that is not possible. You cannot become stone.
So the whole process is to rectify, to purify your senses. And the purified sense means instead of using the senses for this so-called material happiness, one has to utilize the senses for happiness of Kṛṣṇa. That is purified sense. The example, the vivid example, is Arjuna. 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.