As for me, I did some works with The School of Metaphysics. As far as I know, Unitarianism is pretty much the same. They both look to many ways of approaching God in self. Some of the other teachings that I have come across are:
Ra- The Law of One
The Emerald Tablets by Thoth the Atlantean
The Egyptian Book of the Dead
The Divine Pymander of Hermes Trismegistus
The Kybalion by Hermes Trismegistus
and The Science of Oneness
These books are mostly all ancient texts that have been interpreted by some of the most brilliant people in history, like Issac Newton and Pythagorean. Another that I am looking at getting a hold of is Edgar Casey books from his School of Mysteries.
I hold speeches on a variety of topics that are all in alignment with Acetics, Carl Jung, Hindu's and Brahman's, Taoism and those ancient teachings of the list above. If you'd like, you can email me and we can see what we have that are in alignment and create an event. I have an organization that I started called, Universal Clarity TM. I teach various forms of meditations and the works of higher intelligence. We also add some flavor of the Ancient Magi's with our teachings, which is understanding the Labyrinth of Life. I know it all flows well with Unitarian Universalism.
Now, to put it an ancient form to today's understanding, I would take from the Alchemist. As is Above, So is Below. As in Heaven, So is in Earth. As in mind, so is in reality.
You are the power of the Universe. Once you understand Human Physiology and the Celestial Bodies and the connection to the mechanics of the two you can become the God or Goddess you so see in mind. Yes, energy penetrates all things, but where is mind, where is knowledge. Mind and knowledge causes all atoms and its individual components to take action to give you the image of life you witness with sense organs. Where science ends with it's smallest particles, universal knowledge causes all action to take place with those particles. Energy is nothing more than knowledge in action. Wisdom is the seed in us all that is awaken with the proper nutrients of understanding and actions are it's result. Light particles expand in all directions at once. Love is it's source. Visions are its results, that's mental and sensory perceptions.
Now, I will leave you with that. All in all, the core to it is love. Expanding like light is how it grows.