Prayer obtains what it is due to obtain — not what I personally want to obtain, which is different. It is useful that islands of prayer exist in the world, even if they are composed of only one person, or two, or three, or four.
The spiritual life can only be lived in the present moment, in the now. All the great religious traditions insist upon this simple but difficult truth. When we go rushing ahead into the future or shrinking back into the past, we miss the hand of God, which can only touch us in the now.