I told him, a man is only aware of light by seeing the surface which light illuminates; light itself is invisible, Also, he is only aware of self through his senses and emotions and mind; self itself is unknowable. In the same way a man is not conscious of enlightenment save through observation of his actions and thoughts, and by noticing the influence he radiates on the world around him, his impact on the not-self.
— The goose is out by William John Gabb (Page 34)
― Gabb W. J., ‘Chapter 5 - The Magic of the Koan’, The Goose is Out, The Buddhist Society, 1956, p.34