Jesus in the last moments of his freedom/life does something that makes no sense at all. He takes off his outer garment and wraps a towel around his waist and washes his disciple's feet. This was so counter cultural in the time and made no sense that a respected teacher/rabbi would ever do this.
So often we are striving to move up in life and we will step on anyone that gets in our way. People push others down so they can go up. But here Jesus, the Creator, takes off his robe and gets on his knees to do the dirtiest job. Why? How?
Jesus had a security in three areas that gave him the ability to do this.
1) Authority - (God put all things under his power)
2) Identity - (Came from the Father)
3) Destiny - (He would return to the Father)
The idea is that if we can understand what we have in Christ (Authority, Identity, and our Destiny) we can take the posture of serving others and loving people.