The discipline of fasting, I am coming to think, is a discipline of perseverance.
The opportunity to indulge in whatever I am fasting from is continually around me; my mental routines and physical habits both bring it to my attention regularly. So I cannot be content with saying at the beginning of Lent that I will fast in a certain way, nor even with waking up each morning with that intention. Instead, my commitment must be renewed every time I am faced with the opportunity to choose otherwise.
It is a fitting type of discipline for this season leading up to Easter, because it is the same discipline Jesus would have had to have to endure the suffering beginning in Gethsemane and culminating in the Crucifixion. As God, he had the power to end his suffering at any point – to step away from the path he had started on. He had to choose, moment by moment, to stay the course, to remain committed to our salvation. The crowds taunted him, saying that if he were the son of God he could save himself, and they were right about his power and opportunity. They just failed to see that his endurance was greater: great enough to enable him to make the sacrifice his unfathomable love demanded.
Fasting cultivates in us that same kind of endurance. Through it we can walk with Jesus in his suffering (though our steps be small and halting indeed), and in him begin to develop the kind of perseverance that can hold fast to something painful – even faced with a way of escape – when love requires it.