“All causes of natural effects have to be given through lines, angles and figures, for otherwise it is impossible for the reason why”

—  Robert Grosseteste

De Lineas, Anguilis et Figuris (On Lines, Angles and Figures) as quoted in Neil Lewis, "Robert Grosseteste" http://plato.stanford.edu/entries/grosseteste/ Stanford Encyclopedia of Philosophy (2007, 2013) citing Baur, Ludwig (ed.) Die Philosophischen Werke des Robert Grosseteste, Bischofs von Lincoln (1912) pp.59–60
Context: The consideration of lines, angles and figures is of the greatest utility since it is impossible for natural philosophy to be known without them... All causes of natural effects have to be given through lines, angles and figures, for otherwise it is impossible for the reason why (propter quid) to be known in them.

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Robert Grosseteste 22
English bishop and philosopher 1175–1253

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