Logic, which stands first, has to render our conceptions and the judgments and reasonings arising from them clear and distinct.
Calvin replied to him in a work published in 1543, in which he defends his own opinions at length, both by general reasonings and by an appeal to both Scripture and the Fathers, especially Augustine.
The Ptolemaic system was, in a geometrical sense, defensible; it harmonized fairly well with appearances, and physical reasonings had not then been extended to the heavens.
Its reasonings were solidly founded on the principle of the relativity of motion.
Gravitation was thus shown to be the sole influence governing the movements of planets and satellites; the figure of the rotating earth was successfully explained by its action on the minuter particles of matter; tides and the precession of the equinoxes proved amenable to reasonings based on the same principle; and it satisfactorily accounted as well for some of the chief lunar and planetary inequalities.