A teaching (yulu) from zen master Dahui (1088-1163) on knowledge and enlightenment.
There are three mistakes. Saying you are obstructed by knowledge is one, saying you are not yet enlightened and willingly being deluded is another, and going on within delusion to use mind to wait for enlightenment is another.
These three mistakes are the root of birth and death. You must stop producing them for a moment, so the mind of these errors is cut off: only then do you realize that there is no delusion to be smashed, no enlightenment to be expected, and no knowledge that can cause obstruction.
Once you recognize the origin of knowledge, then this very knowledge is a field of liberation, the place to get out of birth and death [samsara].
If views of delusion and enlightenment perish and interpretations of turning towards and turning away are cut off, then this mind is lucid and clear as the bright sun and this nature is vast and open as empty space; right where the person stands, he emits light and moves the earth, shining through the ten directions.
Those who see this light all realize acceptance of things as unborn [anutpattika-dharmakshanti].
When you arrive at such a time, naturally you are in tacit accord with this mind and this nature. Only then do you know that in the past there was basically no delusion and now there is basically no enlightenment.
(Cleary, Jonathan C.: Swampland Flowers; the letters and lectures of Zen Master Ta Hui.
Boston 2006, p. 81, 82, 84)