Note 8 at Phil. 2:4: The way we implement the instruction of the previous verse to "esteem other better than themselves" is to look at the other person's side of things instead of seeing everything through selfish eyes. If we think only about ourselves, we will be selfish. If we get out of self and think more about the benefit of others than the benefit of self, then we will be selfless. It's a matter of focus. Whichever side of things we focus on is the side we will take. Therefore, "Look not every man on his own things, but every man also on the things of others."