It is work expected of each and everyone of us. And, if anyone here feels her or himself above this life of service, she or he is outside of the realm of Christ. In that time and age, it was the youngest who performed the lowliest service. Jesus is teaching His followers, especially those who are leaders, the need for lowly service. First of all, it means a total conversion of attitude.
Service means a slave-like, humble demeanor.
Service means there is no room for the executive or presidential style of decision-making within the church. Ministers, Councils, Classes, and Synods cannot simply announce decisions that are imposed as if there was a pyramid of power. Those within the church who think they can give orders, make demands, and issue decrees had best think again. The Last Supper is not the only time the disciples argued about their relative greatness. Little children do not think overly much of themselves.