Passage
Jesus 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.
Jesus 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.
John 13:8 Peter saith unto him, Thou shalt never wash my feet. Jesus answered him, If I wash thee not, thou hast no part with me.
John 13:9 Simon Peter saith unto him, Lord, not my feet only, but also my hands and my head.
John 13:10 Jesus 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.
John 13:11 For he knew who should betray him; therefore said he, Ye are not all clean.
John 13:12 So 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?
The verse centers on "jesus", "saith", "washed", "needeth", "save", "feet", and "clean". It is saying that the verse draws attention to "jesus" and "saith", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 9's "Simon Peter saith unto him Lord not..." into verse 11's "For he knew who should betray him...", so "jesus" and "saith" 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 "jesus" and "saith" with trust shaped by these words, not by a vague optimism outside the passage.