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.
We have to be on our guard against wanting to judge for ourselves what point we have reached in the way of pure love. Only God knows this. What we recognize of ourselves, also of our faults and failings, is only the illuminated part of the surface. The deep roots are also hidden from us. God, who knows these, can purify them.