11 And, therefore, He said to Simon: “You see this woman. I entered into your house, and you gave Me no water for My feet, but she has washed My feet with her tears.” We are all the one body of Christ, the head of which is God, and we are the members; some perchance eyes, as the prophets; others teeth, as the apostles, who have passed the food of the Gospel preached into our breasts, and rightly is it written: “His eyes shall be bright with wine, and his teeth whiter than milk.” And His hands are they who are seen to carry out good works, His belly are they who distribute the strength of nourishment on the poor. So, too, some are His feet, and would that I might be worthy to be His heel! He, then, pours water upon the feet of Christ, who forgives the very lowest their offenses, and while delivering those of low estate, yet is washing the feet of Christ.
Source: Letters (New Advent)