John 17:22-23 - I have given them the glory that you gave me, that they may be one as we are one: I in them and you in me. May they be brought to complete unity to let the world know that you sent me and have Loved them even as you have Loved me.
Jesus wanted to make it as easy for us as possible. He knew we would face trials, so He wanted to give us everything that He had; He made it all available to us. Jesus did this so that we could walk in unity with each other as He and the Father are in unity.
In order for us to be in unity like them we must look at the way they are unified. We see God, Jesus and the Holy Spirit. These three beings are unified together in such a way that you cannot tell where one stops and the next one starts. They also never act individually. Jesus tells us that He only does what his Father tells Him.
Now we have Christ in us and He has God in Him, therefore,we have God in us. So when Jesus is talking about us being in unity He is not just talking with each other , but with Him and God. That is the true picture of unity: Jesus in us and God in Him, with us only acting based on what we hear from them.
Imagine walking the earth as Jesus did, preaching and teaching. And if the sick came to Him they were healed. All this could be you as well. Once you enter into unity with the Triune God the world will see and know that God Loves you and is in you.