St. Gregory Palamas offers us insights about fasting. The following are excerpts from Homily Six “To encourage Fasting.”
The invisible serpent, the originator of evil, is inventive, versatile and extremely skillful in contriving wickedness. He has means to hinder our good purposes and actions as soon as they begin…
But we, brethren, should rise above this trap by our soul’s courage, eagerness and faith. We should bear in mind the fact that just as the earth cannot yield worthwhile fruit without labor, so the soul cannot acquire anything which pleases God or leads to salvation without spiritual struggles. But while it is possible to find earth which is unsuitable for cultivation, every human soul is naturally suited to virtue. As we are all unavoidably condemned, however, by the judgment given against our forefather, to live by labor and toil, let us turn necessity into an honor and willingly offer to God what is ours not by our own will. Let us give up transitory things in exchange for things that endure, and receive what is beneficial in exchange for what is harmful, transforming short-lived toil into a means to gain eternal ease. If we labor here for the sake of virtue we shall certainly attain to the rest promised in the age to come…
When we remember this and eagerly apply ourselves to virtuous actions, the evil one, knowing that nothing can be good unless it is done in a good way, strives to persuade us not to accomplish any good work with the object of pleasing God or of winning His approval, but to look for other people’s approval…
Even after suffering this defeat, the originator of evil undermined us with pride, the last and worst abyss…
…Fasting was of no benefit to that Pharisee in the Gospel, even though he always fasted two days a Week, because he had adulterated it with pride and condemnation of his neighbor (Luke 18:11-12). Not that this means fasting is unprofitable. Moses, Elijah and the Lord Himself showed how beneficial it is for those who fast properly in a way pleasing to God.
Fasting is a way to develop our soul but must be done with the “right” spirit. We must be aware that pride is something than can make all our good intentioned efforts useless. Beware of all the temptations to give up the fast or to show off our exemplary behavior.