“The true fast is to loose the bonds of injustice (Isa. 58:3–6; Jer. 14:12). In large part the struggle of the prophets is directed against the external, self-righteous worship of the people. Accordingly, the essence of the new dispensation is that the Lord will make a new covenant with his people. He will give them a new heart and write his law on it. He will pour out his Spirit on all so that they will love him with their whole heart and walk in his ways….” (Herman Bavinck, Reformed Dogmatics, Vol. 4, p. 659).
“Fasting, like almsgiving and prayer, is to be between the disciple and God. No one else should know. (Perhaps that is why we know so little of early Christian practice in this regard.)” (R. T. France, The Gospel of Matthew, p 255).
“If a man is living entirely to the glory of God, you need not prescribe for him when he has to fast, you need not prescribe the sort of clothes he has to put on or anything else. If he has forgotten himself and given himself to God, the New Testament says that man will know how to eat and drink and dress because he will be doing it all to the glory of God.” (D. Martyn Lloyd-Jones Studies in the Sermon on the Mount, Vol. 2, p. 44),
Quotes from the Reflection for Trinity Presbyterian Church