"The North Pole, he said, was not so very far away, and the difficulties in the way of reaching it were not, on the face of them, so very great: human ingenuity had achieved a thousand things a thousand times more difficult; yet in spite of over half-a-dozen well-planned efforts in the nineteenth century, and thirty-one in the twentieth, man had never reached: always he had been baulked, baulked, by some seeming chance -- some restraining Hand: and herein lay the lesson -- _herein the warning_."