CONTRIBUTION AND SERVICE TO THE ONE IN ALL
There is no need to believe in a sentient "god" or "absolute being" to realize the "Unity of Existence."
Existence is an entity - a phenomenon - that has the inherent ability to produce and experience sentient creatures such as ourselves.
All our activities are a contribution to the health and welfare of Life on Earth. Each one of us is a part of "The Unity of Existence." We all have the capacity to be aware of this and to choose to contribute and serve the health and welfare of "The One in All."
By logical reasoning we can quickly realize "The Unity of Existence" and everyone's essential identity as a part of Existence.
All phenomena arise from "The Unity of Existence." Sentience and mind are part of Existence and the experiencer of all various and diverse phenomena is the same entity - Existence.
Whatever we do, we can make our activities as positive and life-enhancing contributions to "The One in All."
This is called "Service."