Jesus knew His sovereign authority, His origin, and coming destiny; yet He voluntarily took the place of a slave, washing the feet of His disciples. – E.A. Blum
 Blum, E. A. (1985). John. In J. F. Walvoord & R. B. Zuck (Eds.), The Bible Knowledge Commentary: An Exposition of the Scriptures (Vol. 2, pp. 319–320). Wheaton, IL: Victor Books.