Passage
So when he had washed their feet, and taken his garments, and sat down again, he said unto them, Know ye what I have done to you?
So when he had washed their feet, and taken his garments, and sat down again, he said unto them, Know ye what I have done to you?
John 13:10 Jesus saith to him, He that is bathed needeth not save to wash his feet, but is clean every whit: and ye are clean, but not all.
John 13:11 For he knew him that should betray him; therefore said he, Ye are not all clean.
John 13:12 So when he had washed their feet, and taken his garments, and sat down again, he said unto them, Know ye what I have done to you?
John 13:13 Ye call me, Teacher, and, Lord: and ye say well; for so I am.
John 13:14 If I then, the Lord and the Teacher, have washed your feet, ye also ought to wash one another`s feet.
The verse centers on "washed", "feet", "taken", "garments", "down", "again", "said", and "done". It is saying that the verse draws attention to "washed" and "feet", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 11's "For he knew him that should betray..." into verse 13's "Ye call me Teacher and Lord and...", so "washed" and "feet" belong inside that flow. In John context, the local focus is the identity of Jesus, new birth, eternal life, and belief and unbelief.
A plain takeaway is to answer the verse's own emphasis on "washed" and "feet" with trust shaped by these words, not by a vague optimism outside the passage.