When the Apostles could not cast out the demon from the possessed boy, the father approaches our Lord and beseeches His help. When Jesus says, "All things are possible to him that believes," the father replies, "Lord, I believe; help Thou my unbelief!"
Isn't this how it is for all of us? On a superficial level, we sincerely do believe, but when push comes to shove, our so-called faith proves to be weak indeed. The Holy Apostle Peter believed he could walk on water because Jesus told him to, but suddenly aware of the tumult of the waves, he began to sink.
In times of peace, it is easy to believe, because there is no cost attached. But when a time of persecution arises and our faith is put to the test by the threat of martyrdom, we shall find how deep and enduring our faith really is. The fact is, true faith is always a gift of God's grace, never an accomplishment for which we can take credit ourselves. So we must possess the humility of the father in the Gospel and pray, "Help Thou my unbelief!" or cry like Peter, "Lord, save me!"
Truly whoever dares trust in his own faith and spiritual accomplishments in times of trial will be lost. Nevertheless, God normally requires an effort on our part before He bestows a gift of grace. When the Apostles asked Him why they could not cast out the demon, Jesus replied, "This kind comes out by naught but prayer and fasting." It is true that we are saved by faith alone, yet (as the Holy Apostle affirms) "faith without works is dead." And these works include, among other things, the disciplines of an ascetic life.
The Kingdom of God is taken by violence, which is to say, we must force ourselves to do that which is contrary to our fallen human nature, ever striving for every virtue and the purification of our hearts. Only then can God give to us a deep and abiding faith that will withstand every storm and tribulation of this life. In these final days of the Great Fast, then, may we redouble our efforts to pray and fast, to deny ourselves the sinful impulses of the passions, and in every way to prepare ourselves to be made worthy to behold our Lord's glorious Resurrection.