Look and you won't see it; it is invisible. Listen and you won't hear it; it is inaudible. Touch and you won't feel it; it is intangible.
Beyond understanding, 7 has no definition. All things merged into a single mystery.
Its heights shine no light. Its depths are not dark. Unbounded and unknowable, It is beyond definition. Formless, obscure beyond conception.
Meeting it, it has no face, Following it, it has no back. You can't know it, but you can be it, when you dissolve your self.
This is the foundation of the way of the pattern.