The moon... is a mass, akin to the mass of the earth,...
The moon... is a mass, akin to the mass of the earth, attracts the waters by a magnetic force, not because they are liquid, but because they possess earthy substance, and so share in the movements of a heavy body.
![Johannes Kepler Quote About Moon, Water, Movement: The Moon Is A Mass...](http://qt.azureedge.net/resources/quotes-images-large/the-moon-is-a-mass-akin-to-the-mass-of-the-earth-attracts-the-waters-by-a-ma-a447ae72243ea364890dc8e5fa6993d1.jpg)