The Tao that can be named is not the real Tao.
In other words: only the tiny circumscribed images and deities of the mind's imagination can be named; for they are but limited things and objects separate from all else.
You can name -- and so distinguish and identify -- mind created pieces or fragments believed to be somewhere within the universe. This is what the mind does, it breaks the universe into smaller and smaller pieces. This works extremely well on a practical day to day level, but when it comes to what the word G-O-D points to, our real, present and boundless Reality, Source and Sustenance, this process of reductionism and conceptualization blinds us to what we seek. Often times, the more scriptures you know, the more written truth you cherish, the less you really know.
How can you name that which has no beginning or end? that which all gods and universes exist within? You can't say It's infinite. Because it's not an IT. It's not a definable thing with form, boundaries or borders. The best you can do is say it's INFINITY itself. But what's infinity? The mind can't grasp it or really understand it. And when this happens you know you're getting warm. You're discovering what is too vast for the mind.
The true God, can not be known as tiny limited things and deities are known. However, since what is endless, is present everywhere, it can be lived as your actual foundational identity.