The Father put all things under Jesus' power. Jesus came from God; He returned to God. So what?
Jesus knowledge of these three things led Him to perform a revolutionary act. Did He overthrow the Roman government and establish a kingdom on earth? No. Did He use that authority to bind Satan and throw him in the lake of fire? No, but He’s going to do that someday. His knowledge of His power and His position led Him to wash the feet of His disciples.
What is the correlation? The IVP New Testament Commentary calls this passage of Scripture “an acted parable of the Lord’s humiliation unto death.” A parable uses a physical, earthly act or situation to teach a spiritual truth or lesson. Usually Jesus told parables verbally but in this case He acted it out. If you compare John 13:4,5, & 12 to Philippians 2:6-11 you can see, without any extra commentary, how Jesus physical act of washing the disciples’ feet compares to the truth of Him forsaking the glory of Heaven and humbling Himself by taking on the form of a man and coming to earth.
If Jesus’ act of washing the disciples’ feet is a picture of Him coming to earth to give His life as a sacrifice for our sins, then all of a sudden, you can see how His knowledge of His power and position correlates with His choice to pour Himself out that we might be saved. He was the only one who had the power and the position to save sinful man. Because of the love He had, like we talked about in the post, "Having Loved His Own", He humbled Himself unto death, even death on a cross.