Matteo 6:18

that thou appear not unto men to fast, but unto thy Father which is in secret; and thy Father, which seeth in secret, shall reward thee openly.

Again the Lord emphasizes the contrast. A mere outward show of repentance without change of heart does not befit the followers of Jesus. Fasting they may practice indeed; that is a laudable custom and may be productive of good. But in doing so, all ostentation must be avoided. It is the heart that should feel the sorrow and humility, not the body. Therefore the usual daily washing and anointing should not be omitted, in order that men might not even know the conditions.

God, their heavenly Father, that lives in the secret places, whose omniscience searches minds and hearts, will know. At the proper time He will make the necessary revelations and grant the reward of mercy.