John 13:11 Meaning

9Simon Peter saith unto him, Lord, not my feet only, but also my hands and my head.

10Jesus saith to him, He that is washed needeth not save to wash his feet, but is clean every whit: and ye are clean, but not all.

11For he knew who should betray him; therefore said he, Ye are not all clean.

12So after he had washed their feet, and had taken his garments, and was set down again, he said unto them, Know ye what I have done to you?

13Ye call me Master and Lord: and ye say well; for so I am.