A few times in the book of John, Jesus instructs us to pray "in His Name". What does this mean? How do we know if we are praying in His name? How would we not be praying in His name?
I don't believe this is using "In Jesus' Name, Amen" as the closing line of our prayers.
Whatever you ask in my name, this I will do, that the Father may be glorified in the Son. If you ask me anything in my name, I will do it. John 14:13-14 ESV
You did not choose me, but I chose you and appointed you that you should go and bear fruit and that your fruit should abide, so that whatever you ask the Father in my name, he may give it to you. John 15:16 ESV
In that day you will ask nothing of me. Truly, truly, I say to you, whatever you ask of the Father in my name, he will give it to you. Until now you have asked nothing in my name. Ask, and you will receive, that your joy may be full. "I have said these things to you in figures of speech. The hour is coming when I will no longer speak to you in figures of speech but will tell you plainly about the Father. In that day you will ask in my name, and I do not say to you that I will ask the Father on your behalf; for the Father himself loves you, because you have loved me and have believed that I came from God. John 16:23-27 ESV
Interestingly, there are other things that refer to "in Jesus' name':
Whoever receives one such child in my name receives me Matthew 18:5 ESV
For where two or three are gathered in my name, there am I among them. Matthew 18:20 ESV
Many will come in my name, saying, 'I am he!' and they will lead many astray. Mark 13:6 ESV