It follows from this that prayer is your first and incomparably most important means of fighting. Learn to pray, and you vanquish all the evil powers that could imaginably assail you. Prayer is one wing, faith the other, that lifts us heavenward. With only one wing no one can fly: prayer without faith is as meaningless as faith without prayer. But if your faith is very weak, you can profitably cry: Lord, give me faith! Such a prayer seldom goes unheard. The grain of mustard seed, says the Lord, grows into a great tree. The person who wants sunshine and air opens the window. It would be folly to sit behind drawn curtains and say: There is no light; there isn’t a breath of air! Let this picture show you clearly how prayer works. God’s power, or grace, is always and everywhere accessibly to all, but one cannot get one’s share of it without wanting it and acting accordingly.
Chapter 15, ON PRAYER, Tito Colliander