The final grade of inner experience, the deepest phase of contemplation, is one where the experiencer himself disappears, the meditator vanishes, the knower no longer has an object--not even the Overself--to know for duality collapses. Because this grade is beyond the supreme ”Light” experience where the Overself reveals its presence visually as a dazzling mass, shaft, ball, or ray of unearthly radiance which is seen whether the bodily eyes are open or closed, it has been called the divine darkness.

Source: The Notebooks of Paul Brunton