I have walked with people whose eyes are full of light but who see nothing in sea or sky, nothing in city streets, nothing in books. It were far better to sail forever in the night of blindness with sense, and feeling, and mind, than to be content with the mere act of seeing. The only lightless dark is the night of darkness in ignorance and insensibility.

The World I Live In and Optimism: A Collection of Essays (ed. Courier Corporation, 2012) - ISBN: 9780486140599