Christ died once. He was buried once. Nevertheless he wants ointment to be poured on his feet each day. What are the feet of Christ on which we pour ointment? They are the feet of Christ of whom he himself says, “What you have done for one of the least of these, you have done to me.” The woman in the Gospel refreshes these feet. She moistens them with her tears when sin is forgiven of the lowest of persons, guilt is washed away, and pardon is granted. The one who loves even the least of God’s people kisses these feet. The one who makes known the favour of his gentleness to those who are frail annoints these feet with ointment. The Lord Jesus himself declares that he is honoured in these martyrs and apostles.
St Ambrose of Milan, Letter 22, quoted in Arthur A. Just (ed). Luke (Ancient Christian Commentary on Scripture) 129.