'A lip' in general signifies doctrine.

In Isaiah 6:3, 7, this signifies the interior parts of a person and thus internal worship where adoration is grounded.

In Isaiah 37:29, this signifies the thought of the understanding

In Malachi 2:6, 7, this denotes doctrine grounded in charity.

(Verweise: Arcana Coelestia 1284, Arcana Coelestia 1288)

441. As for the second kind of experience, being led by the spirit into another place, I have been shown by firsthand experience what happens and how it happens, but only two or three times. I should like to cite just one experience. While I was walking through city streets and through the countryside, absorbed in conversation with spirits, it seemed exactly as though I were just as awake and observant as ever, walking without straying, though all the while I was in visions. I was seeing groves, rivers, mansions, houses, people, and more. After I had been walking for some hours, though, I suddenly found myself back in consciousness of my physical sight and realized that I was somewhere else. I was utterly stunned by this, and realized that I had been in the state of people described as being led by the spirit into another place; for as long as it lasted I was not thinking about my route, even though it might have been many miles, or about the time, though it might have been many hours or even days. I was not conscious of any fatigue, either. This is how we can be led by ways we know nothing of all the way to some predetermined place, without straying.