John 13:12

When he had washed their feet and put on his clothes and taken his place, he said to them again, "Do you understand what I have been doing to you?

Jesus answered, "You cannot understand now what I am doing, but you will learn by and by."

"Do you understand all this?" They said to him, "Yes."

And Jesus said, "If you do not understand this figure, then how will you understand my other figures?

rose from the table, took off his outer clothing, and fastened a towel about his waist.

Treasury of Scripture Knowledge

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?

Jesus answered, "You cannot understand now what I am doing, but you will learn by and by."

"Do you understand all this?" They said to him, "Yes."

And Jesus said, "If you do not understand this figure, then how will you understand my other figures?