“If ye know these things, happy are ye if ye do them.”
King James Version (KJV)
Joh 13:17 If ye know these things, happy are ye if ye do them. Know what things? Of course they knew that Christ had washed their feet. But did they know what he meant? The meaning is clearly, "If ye understand the meaning of my act, happy are ye if ye exemplify the same spirit in your lives".