Jesus taught that prayer must be in His name (John 14:12-14; 15:7, 16; 16:23, 24). 

In these verses Jesus teaches clearly that if we expect to receive what we ask for we must ask for those things in His name.  What does that mean?  Well, in the first passage (Jn. 14:10-14), Jesus shows us that praying in His name is praying in oneness or in unity with Him—that just as Jesus is one with the Father, we demonstrate that we are one with Jesus (and the Father) when we pray in His name.  For when Jesus ascended to the Father, the Holy Spirit came to us and united us with the Father and Son.  And so when we pray in His name we demonstrate our oneness with Him, because we pray in unity with the Son who is one with the Father.  And we do it by the Spirit.  Then…