In Zechariah 6 verse 12, Zechariah was told to give Joshua the high priest a message:
12 Then speak to him, saying, ‘Thus says the Lord of hosts, saying:
“Behold, the Man whose name is the BRANCH!
From His place He shall branch out,
And He shall build the temple of the Lord;
The Man whose name is the BRANCH, refers to Jesus and Joshua who had had a crown put on his head (verse 11) was a type, a foreshadow of Jesus.
A branch connects fruit on a tree to its life source the trunk of the tree and in that way it makes fruit possible. In the same way Jesus is the only means by which there is fruit in our life. He connects the fruit in us to its life source (God) and it is only through that connection that fruit is possible.
Jesus is the only way we can bear fruit, because He is the branch that connects us to our life source.