Jesus answered and said to him, "What I am doing you do not understand now, but you will know after this."
John 13:7
Surrounding context
13:6 Then He came to Simon Peter. And Peter said to Him, "Lord, are You washing my feet?"
13:7 Jesus answered and said to him, "What I am doing you do not understand now, but you will know after this."
13:8 Peter said to Him, "You shall never wash my feet!" Jesus answered him, "If I do not wash you, you have no part with Me."