"Man..., by his understanding or intellect, has been able to gain control of and adapt some... natural laws to his own needs. By the power of his intellect he has discovered means by which he not only traverses great continents in express trains and crosses vast oceans in ships, but, like the fish, he travels under water in submarines, and, imitating the birds, he flies through the air in airships." (Pt 42)
(51:7)
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