“So the attitude that comes from selfishness is hostile to God. It doesn’t submit to God’s Law, because it can’t.”
Romans 8.7 CEB
The self-serving attitude is diametrically opposed to serving God. The meaning of conversion is to move from one to the other. Serving both is impossible.
Jesus never performed a miracle to serve himself. So he refused to turn a stone into bread. How can I refuse catering to self in order to obey God?