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When Gilbert of Colchester, in his “New Philosophy,” founded on his researches in magnetism, was dealing with tides, he did not suggest that the moon attracted the water, but that “subterranean spirits and humors, rising in sympathy with the moon, cause the sea also to rise and flow to the shores and up rivers”. It appears that an idea, presented in some such way as this, was more readily received than a plain statement. This so-called philosophical method was, in fact, very generally applied, and Kepler, who shared Galileo’s admiration for Gilbert’s work, adopted it in his own attempt to extend the idea of magnetic attraction to the planets.
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Note reference: William Gilbert's New Philosophy about our Sublunary World or De Mundo Nostro Sublunari Philosophia Nova (1651)
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Walter William Bryant, Kepler The Macmillan Company (1920) p.35

 

Johannes Kepler

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His [Sarpi's] career soon revealed another cause of his return; he evidently felt the same impulse which stirred his contemporaries, Lord Bacon and Galileo, for he began devoting himself to the whole range of scientific and philosophical studies, especially to mathematics, physics, astronomy, anatomy, and physiology. In these he became known as an authority, and before long was recognized as such throughout Europe. It is claimed, and it is not improbable, that he anticipated Harvey in discovering the circulation of the blood, and that he was the forerunner of noted discoverers in magnetism. Unfortunately the loss of the great mass of his papers by the fire which destroyed his convent in 1769 forbids any full estimate of his work; but it is certain that among those who sought his opinion and advice were such great discoverers as Acquapendente, Galileo, Torricelli, and Gilbert of Colchester, and that every one of these referred to him as an equal, and indeed as a master.

 

Andrew Dickson White

 

Afterwards that incomparable Philosopher Sir Isaac Newton, improv'd the hint, and wrote so amply upon this Subject as to make the Theory of the Tides his own, by shewing that the Waters of the Sea rise under the Moon and the Place opposite to it: For Kepler believ'd "that the Impetus occasion'd by the presence of the Moon, by the absence of the Moon, occasions another Impetus; till the Moon returning, stops and moderates the Force of that Impetus, and carries it round with its motion." Therefore this Spheroidical Figure which stands out above the Sphere (like two Mountains, the one under the Moon and the other in the place opposite to it) together with the Moon (which it follows) is carried by the Diurnal Motion, (or rather, according to the truth of the matter, as the Earth turns towards the East it leaves those Eminencies of Water, which being carried by their own motion slowly towards the East, are as it were unmov'd) in its journey makes the Water swell twice and sink twice in the space of 25 Hours, in which time the Moon being gone from the Meridian of any Place, returns to it again.

 

Johannes Kepler

 

Each of the parts of philosophy is a philosophical whole, a circle rounded and complete in itself. In each of these parts, however, the philosophical Idea is found in a particular specificality or medium. The single circle, because it is a real totality, bursts through the limits imposed by its special medium, and gives rise to a wider circle. The whole of philosophy in this way resembles a circle of circles. The Idea appears in each single circle, but, at the same time, the whole Idea is constituted by the system of these peculiar phases, and each is a necessary member of the organisation.

 

Georg Wilhelm Friedrich Hegel

 

But to return to Kepler, his great sagacity, and continual meditation on the planetary motions, suggested to him some views of the true principles from which these motions flow. In his preface to the commentaries concerning the planet Mars, he speaks of gravity as of a power that was mutual betwixt bodies, and tells us that the earth and moon tend towards each other, and would meet in a point so many times nearer to the earth than to the moon, as the earth is greater than the moon, if their motions did not hinder it. He adds that the tides arise from the gravity of the waters towards the moon. But not having just enough notions of the laws of motion, he does not seem to have been able to make the best use of these thoughts; nor does he appear to have adhered to them steadily, since in his epitome of astronomy, published eleven years after, he proposes a physical account of the planetary motions, derived from different principles.

 

Johannes Kepler

 

If my soul could get away from this so-called prison, be granted all the list of attributes generally bestowed on spirits, my first ramble on spirit wings would not be among the volcanoes of the moon. Nor should I follow the sunbeams to their sources in the sun. I should hover about the beauty of our own good star. I should not go moping among the tombs, nor around the artificial desolation of men. I should study Nature's laws in all their crossings and unions; I should follow magnetic streams to their source and follow the shores of our magnetic oceans. I should go among the rays of the aurora, and follow them to their beginnings, and study their dealings and communions with other powers and expressions of matter. And I should go to the very center of our globe and read the whole splendid page from the beginning. But my first journeys would be into the inner substance of flowers, and among the folds and mazes of Yosemite's falls. How grand to move about in the very tissue of falling columns, and in the very birthplace of their heavenly harmonies, looking outward as from windows of ever-varying transparency and staining!

 

John Muir