A Connector
Every man is a connector, connecting The Source to everything. The Source transfers His qualities through all the connections. The Source selects what substance to transfer and how He would transfer it, meaning through which connector. And a connector is just a connector. A connector just waits until he be chosen and used for a transfer.
Well, that is not totally true. I believe The Source also cares about the development of a connector. He wants a connector to become more and more improved so He can use the connector for a higher quality and quantity of transfers. The Source expects a cup not only to be able to contain water, but also high quality wine. A cable which can deliver high electricity power. A huge tree that can be a shelter for many birds.
It is a man responsibilty to upgrade himself so he can accomplish a more enhanced purpose.