Praying without ceasing means at least three things. First it means that there is a spirit of dependence that should permeate all we do… So even when we are not speaking consciously to God, there is a deep, abiding dependence on Him that is woven in to the heart of faith. Second… [it] means praying repeatedly and often. Third, [it] means not giving up on prayer. Don’t ever come to a point in your life where you cease to pray at all.
John Piper