六祖大師法寶壇經 1.106

1.106

"Not seeing a single thing while preserving the view of non-seeing
Is very like floating clouds veiling the sun's face.
Not knowing a single thing while guarding empty knowing
Is just like lightning flashing across the great void.
Once such vision and knowledge suddenly arise,
You mistake their recognition; how could you understand skillful means?
If you recognize your error in a single thought,
Your own spiritual radiance will constantly appear."