Meditate upon a ray of light that pierces through the window on a sunny day. Now imagine how that ray exists engulfed within its source, the sun.

Think of the entire universe as a stream of conscious thought. Imagine that thought in its place of conception, a place before words, before thoughts, a place where there is only One.

Our minds do not allow us to see this stream of divine energy, never mind its source. Instead, we see objects, things, a world.

But if our eyes were allowed to see and our minds permitted to grasp, we would gaze in utter astonishment at a world emerging into being at every moment out of the utter void.

Rabbi Schneur Zalman of Liadi, Shaar Hayichud Veha'emunah.