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“...by shortening the labours doubled the life of the astronomer.

{On the benefit of John Napier's logarithms.}”
― Pierre-Simon Laplace

“Foreshadowings of the principles and even of the language of [the infinitesimal] calculus can be found in the writings of Napier, Kepler, Cavalieri, Fermat, Wallis, and Barrow. It was Newton's good luck to come at a time when everything was ripe for the discovery, and his ability enabled him to construct almost at once a complete calculus.”
― W.W. Rouse Ball, A Short Account of the History of Mathematics