There is nowhere outside the Buddha mind (by Huang-po)

This pure mind, which is the source of all things, shines forever with the radiance of its own perfection. But most people are not aware of it, and think that mind is just the faculty that sees, hears, feels, and knows.
Blinded by their own sight, hearing, feeling, and knowing, they don't perceive the radiance of the source. If they could eliminate all conceptual thinking, this source would appear, like the sun rising through the empty sky and illuminating the whole universe.
Therefore, you students of the Tao who seek to understand through seeing, hearing, feeling, and knowing, when your perceptions are cut off, your way to mind will be cut off and you will find nowhere to enter.
Just realize that although mind is manifested in these perceptions, it is neither part of them nor separate from them. You shouldn't try to analyze these perceptions, or think about them at all; but you shouldn't seek the one mind apart from them.
Don't hold on to them or leave them behind or dwell in them or reject them. Above, below, and all around you, all things spontaneously exist, because there is nowhere outside the Buddha mind.