To go up in the kingdom, you go down.
The one who gives their attention to the least of people and serves, gives, loves and invests is truly great. Losing oneself for the sake of the kingdom, for the sake of serving others...is truly great. Not promoting oneself. Not being in the company of the rich and famous. Not having power over people.
Jesus offers a radically different definition of greatness and one in which everyone is capable of achieving! It is not based on comparing or competing. It is based on loving and serving. Jesus' focus is on others.