Answer: By true unity we create a force that is external to us. If I connect with you, a common force that does not exist in each of us appears between us.
It is actually thanks to the fact that each of us is an egoist that when we each reject our egoism, it enters the space between us and there a common force is created out of our egoistic forces, and we concentrate in it and reveal the Creator.
This is an internal action.
From KabTV’s “Fundamentals of Kabbalah” 8/19/18