"If I can't picture it, I can't understand it."
"Never interrupt someone doing what you said couldn't be done."
"In a time not distant, it will be possible to flash any image formed in thought on a screen and render it visible at any place desired. The perfection of this means of reading thought will create a revolution for the better in all our social relations."
"A compass, I learnt when I was surveying, it'll... it'll point you True North from where you're standing, but it's got no advice about the swamps and dessert and chasm that you'll encounter along the way. If in pursuit of your destination, you plunge ahead, heedless of obstacles, and achieve nothing more than to sink in a swamp... What's the use of knowing True North?"