as quoted by John Freely, Before Gaileo: The Birth of Modern Science in Medieval Europe (2012)
John Peckham:
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John Peckham: Frases en inglés
“Among all the studies of natural causes and reasons, light most delights the contemplators”
Perspectiva communis, translated by, and appearing in the notebooks (C.A.<sub>543r</sub>) of Leonardo da Vinci, as quoted by Martin Kemp, Leonardo Da Vinci: The Marvellous Works of Nature and Man (2006) p. 112.
Contexto: Among all the studies of natural causes and reasons, light most delights the contemplators; among the great things of mathematics, the certainty of its demonstrations most illustriously elevates the minds of its investigators; perspective must therefore be preferred to all human discourses and disciplines, in the study in which radiant lines are expounded by means of demonstrations and in which the glory is found not only of mathematics, but also physics: it is adorned with the flowers of one and the other.
De Oculo Morali quoted in Georg Herzfeld (ed.) An Old English Martyrology (1900)
Contexto: Formerly the Church with its prelates of old time, was golden in wisdom, silver in cleanness of life, brazen in eloquence, which are three things needful to a preacher; that is, brightness of wisdom, cleanness of life, and sonorousness of eloquence. But of the feet, the last, that is the modern prelates, part is iron through their hardness of heart, and part is clay by their carnal luxury.
Note the assumption that the heavenly sphere is concave with respect to the earth.
Perspectiva communis as quoted in J. D. North, Stars, Mind and Fate: Essays in Ancient and Mediaeval Cosmology (1989) citing D.C. Lindberg, John Pecham and the Science of Optics: Perspectiva communis (1970) p.99
De Oculo Morali quoted in Georg Herzfeld (ed.) An Old English Martyrology (1900)
Footnote: Mr. Martin [editor] remarks upon this letter: "The avarice of the Cistercians had already been noticed by Richard I., who, when accused of having at home three daughters whom he loved more than the grace of God, viz., Pride, Luxury, and Avarice, replied: 'No, they are no longer at home. My daughter Pride I have married to the Templars, Luxury to the Black Monks, and Avarice to the White Monks.'" (Pref. to Vol. II., Peckham's Register p. lviii.)
Letter DLIV (June 14, 1284) Archbishop Peckham to King Edward I., from (Charles Trice Martin, ed.) Registrum epistolarum fratris Johannis Peckham: Archiepiscopi Cantuariensis quoted in Georg Herzfeld (ed.) An Old English Martyrology (1900)