Roger Bacon:

The study of optics is of the greatest utility, for it teaches us to understand the nature of light, and of all things that are visible.

— Roger Bacon Medieval

Early advocate of scientific method

Opus Majus, Part V, Chapter I

c. 1267

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"The common way of teaching is rather for ostentation than for instruction."

"The true knowledge is hidden from the common people, and is only revealed to a few."

"For the infidels possess many excellent things, and much wisdom, from which we Christians can derive profit."

"Theories are of no use unless they can be verified by experiment."

"Theology itself, which is the queen of the sciences, cannot be perfect without philosophy."