A few examples will make this clear, hopefully. A man wants to become a cop. He may do so in order to be a boss in the community, or he may do so in order to assist in keeping law and order, for the good of all the citizens, and it may even cost him his life. A young man may want to become a priest. Or is it to bring men to heaven, even to the great sacrifice of his life itself in that service.
Selfishness is out.
All for the greater honor and glory of God is in. When I see children reading even innocent novels I am horrified, and they all know it. Still they do it. They want that needless and useless pleasure. They could read good books that lead them into the embrace of God, but selfishness keeps them doing something that is self-centered.