Evidence

John 17:20-23 We as followers today need to be in this one heart and mind as Jesus prayed for His disciples in this prayer during His last hours spent with them.

How do we mature in oneness as Jesus states? One by practicing what we preach! Live out what we read and learn in our Bible continuing in communication with Christ through the Holy Spirit as He guides us in our daily tasks. Also through our love for one another by "getting dirty knees" as portayed by Jesus when He bowed down on His knees washing His disciples feet
 Jn 13:1-11 and completing with prayer for them as we read the 17th chapter!

So as we mature in oneness we give this godless world evidence that Jesus was sent to this earth to reveal God's being to  us, of who He is and what He does Jn 17:26 and that He (Jesus) and God our heavenly father loves us!