John 13:9

Not my feet only ... - Peter, with characteristic readiness and ardor, saw now that everything depended on this. His whole salvation, the entire question of his attachment to his Master, was involved. If to refuse to have his feet washed was to be regarded as evidence that he had no part with Jesus, he was not only willing, but desirous that it should be done; not only anxious that his feet should be cleansed, but his hands and his head - that is, that he should be cleansed entirely, thoroughly. Perhaps he saw the spiritual meaning of the Saviour, and expressed his ardent wish that his whole soul might be made pure by the work of Christ. A true Christian is desirous of being cleansed from all sin. He has no reserve. He wishes not merely that one evil propensity should be removed, but all; that every thought should be brought into captivity to the obedience of Christ 2 Corinthians 10:5; and that his whole body, soul, and spirit should be sanctified wholly and be preserved blameless unto the coming of the Lord Jesus Christ, 1 Thessalonians 5:23. His intellect, his will, his affections, his fancy, memory, judgment, he desires should be all brought under the influence of the gospel, and every power of the body and mind be consecrated unto God.