"Galileo Galilei", often known mononymously as "Galileo", was an Italian physicist, mathematician, engineer, astronomer, and philosopher who played a major role in the Scientific Revolution/scientific revolution during the Renaissance. His achievements include improvements to the telescope and consequent astronomical observations and support for Nicolaus Copernicus/Copernicanism.

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I have never met a man so ignorant that I couldn't learn something from him.

Where the senses fail us, reason must step in.

Doubt is the father of invention.

Mathematics is the language with which God has written the universe.

Measure what is measurable, and make measurable what is not so.

All truths are easy to understand once they are discovered; the point is to discover them.

In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual.

The Sun, with all the planets revolving around it, and depending on it, can still ripen a bunch of grapes as though it had nothing else in the Universe to do.

You cannot teach a man anything; you can only help him find it within himself.

The Bible shows the way to go to heaven, not the way the heavens go.

I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.

Long experience has taught me this about the status of mankind with regard to matters requiring thought: the less people know and understand about them, the more positively they attempt to argue concerning them, while on the other hand to know and understand a multitude of things renders men cautious in passing judgement upon anything new.