One thing that the Pentecostal and catholic traditions have in common is an undistracted devotion to the spiritual discipline of fasting. The catholic tradition’s practice of regular fasting–days from the early church for each week, each season of the year, and guidelines for the faithful– and the Pentecostal’s warlike ethos of fasting for the sake of spiritual breakthrough come together in some unique ways in my life. As someone raised in the Pentecostal tradition, I do believe fasting is an act of war–not only against the indwelling sinner, but also against the powers and principalities who are arrayed against the people of God and His Christ. It’s a heritage that has taken the words of Jesus to heart: “this kind can only be cast out by prayer and fasting.” (Mark 9:29).
Much has been written by pastors and practitioners over the years of the impact of fasting. The practical results, the typical psychological and physical effects, and the “pro tips” for holding up your commitment. Those may well have their place, but if the Pentecostal experience–and the stories of great ascetics like St. Antony of Egypt, St. John Climacus, or St. Colum Cille– bears out, then the spiritual battle that we enter in fasting is of far greater import and impact than any of the practical tips offered by these leaders.
Tradition tells of St. Antony being attacked by demons when he retreated to the desert for prayer and fasting, and how the Lord strengthened him in the face of those assaults. St. Patrick recounts an assault by the devil while fasting in the wilderness of Gaul that prevented him from moving, and how he cried out to the Lord, and the weight was lifted. St. Moses the Ethiopian, St. John Damascus, St. John of the Cross, and many others throughout our history have other testimonies. Fasting puts a target on your back–but the Lord Jesus already has the victory, and communicates that grace to us through the Holy Spirit at work within us.
So, when you fast, fast in full confidence that God is already present, already speaking, and already giving grace to you. But also fast in the full knowledge that you have personally declared war on the world, the flesh, and the devil, and their wrath will be focused on you. But as Martin Luther wrote so many years ago: “The Prince of darkness grim; we tremble not for him! His rage we can endure for, lo, his doom is sure; one little word shall fell him.”