That you appear not unto men to fast, but unto your Father who is in secret: and your Father, who sees in secret, shall reward you openly.
All Commentaries on Matthew 6:18 Go To Matthew 6
Augustine of Hippo
AD 430
A question is here wont to be raised; for none surely would literally enjoin, that, as we wash our faces from daily habit, so we should have our heads anointed when we fast; a thing which all allow to be most disgraceful.
Or; by the head we rightly understand the reason, because it is preeminent in the soul, and rules the other members of the man. Now anointing the head has some reference to rejoicing. Let him therefore joy within himself because of his fasting, who in fasting turns himself from doing the will of the world, that he may be subject to Christ.