Through His High Priest ministry at the Right Hand of Power, Christ keeps us the in the presence of the Father. He is always offering the sweet incense of our needs to God. If we are always obeying the Word of God, our prayer never stops. It is a part of the ceaseless life of God in us. Jesus never said anything about it.
Confident prayer is answered prayer.
It is the kind that is answered, though it may not be answered in the way we expect. I think one reason we so often become disillusioned is that we take the things written in the Bible, and water them down to make sense to our natural mind instead of staying before the presence of God, and letting the Holy Ghost give us wisdom and insight into what God is doing in us. If the things of God could be revealed to the natural mind, then we would not need the Holy Ghost at all. We could just go to school, read a prayer book, and become prayer giants. The truth is that it is not worthwhile for Jesus to speak to the natural mind.