The ground of the world is the being of inward love appearing outwardly as light

"When we enter into that divine condition which is in a state of balance, a state of ever-repeated balance between the luciferic and the ahrimanic, and when we grasp this in its deepest essence, we then realize--if we look correctly--that wherever the influence of Lucifer is not and wherever the influence of Ahriman is not, that is where there exists what comes from the progressive divine spirituality which is linked to the evolution of humanity. If, in the realms into which the luciferic constantly streams and into which the ahrimanic constantly streams, we look toward the divine that holds the balance, we find there pure love as the fundamental force of everything that streams continuously, forming the human being outwardly, and giving him soul and spirit inwardly. This fundamental force is pure love. In its substance and in its being, and insofar as it is the cosmos of the human being, the universe consists of pure love, it is nothing other than pure love. In the part of the divine that is associated with the human being we find nothing except pure love. This love is something inward; souls can experience it inwardly. It would never achieve an outward appearance if it did not first build itself a body out of the etheric element of light. When we observe the world in a genuinely occult manner we cannot help but say to ourselves: The ground of the world is the being of inward love appearing outwardly as light."

— Rudolf Steiner, lecture of September 19, 1924, in The Book of Revelation and the Work of the Priest, p. 210. Blackboard drawing by Rudolf Steiner.

At-one-ment 

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Awash in a Sonburst Sea

You—Love—and I—Love—and Love Divine:

We are the Trinity

You—Love—and I—We are One-Two-Three

Twining Eternally

Two—Yes—and One—Yes—and also Three:

One Dual Trinity

Radiant Calvary

Ultimate Mystery