Thus the wisdom enshrined in the laws of the visible world, all its strength and all its stability, is a manifestation of the Unseen God. Invisible in themselves, the eternal power and godhead of Iahvah become visible in His creation. And, as the Hebrew mode of expression indicates, His activity is never suspended, nor His presence withdrawn. The conflict of the elements, the roar of the thunder, the flash of the lightning, the downpour of waters, the rush of the stormwind, are His work; and not less His work, because we have found out the "natural" causes, that is, the established conditions of their occurrence; not less His work, because we have, in the exercise of faculties really though remotely akin to the Divine Nature, discovered how to imitate, or rather mimic, even the more awful of these marvellous phenomena. Mimicry it cannot but appear, when we compare the overwhelming forces that rage in a tropical storm with our electric toys. The lightnings in their glory and terror are still God's arrows, and man cannot rob His quiver. Nowadays more is known about the machinery of the world, but hardly more of the Intelligence that contrived it, and keeps it continually in working order, nay, lends it its very existence. More is known about means and methods, but hardly more about aims and purposes. The reflexion, how few are the master-conceptions which modern speculation has added to the treasury of thought, should suggest humility to the vainest and most self-confident of physical inquirers. In the very dawn of philosophy the human mind appears to have anticipated as it were by sudden flashes of insight some of the boldest hypotheses of modern science, including that of Evolution itself.