Claiming the power that is in Christ's name is not some complicated, hidden theological truth. In my library are books written solely on the subject of Jesus' name. The authors wrote them to help believers understand the deep implications hidden in Christ's name. Yet, most of these books are so "deep," they go right over readers' heads.
I believe the truth we're meant to know about Jesus' name is so simple, a child could understand it. It's simply this: When we make our requests in Jesus' name, we're to be fully persuaded that it's the same as if Jesus himself were asking the Father. You ask, How could this be true? Let me explain.
We know that God loved his Son. He spoke with Jesus and taught him during his time on earth. And God not only heard but answered every request his Son made. Jesus testified to this, saying, "He heareth me always." In short, the Father never denied his Son any request.
Today, all who believe in Jesus are clothed in his Sonship. And the heavenly Father receives us as intimately as he receives his own Son. Why? It's because of our spiritual union with Christ. Through his crucifixion and resurrection, Jesus has made us one with the Father. "That they all may be one; as thou, Father, art in me, and I in thee, that they also may be one in us…I in them, and thou in me" (John 17:21–23).
Simply put, we are now family—one with the Father, and one with the Son. We've been adopted, with the full rights of inheritance possessed by any child. This means all the power and resources of heaven are made available to us, through Christ.
Praying "in the name of Jesus" is not a formula. It is not the phrase that has power in simply speaking it. The power is in believing that Jesus takes up our cause and brings it to the Father on his own merits. He is the Advocate—he is doing the asking for us. The power is in fully trusting that God never denies his own Son and we are the beneficiary of the Father's utter faithfulness to his Son.