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Mathematics is the key and door to the sciences.

— Galileo Galilei Misattributed Building Fluency Through Practice and Performance (2008)

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Source, in full

As quoted in Building Fluency Through Practice and Performance (2008) by Timothy Rasinski and Lorraine Griffith, p. 64, but in fact a quotation by Roger Bacon: Et harum scientiarum porta et clavis est Mathematica, "And of these sciences the door and key is mathematics", from Bacon's Opus Majus (1267) .

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More quotes by Galileo Galilei

Wine is a mixture of moisture and light.

Lorenzo Magalotti's Scientific and Scholarly Letter (1721)

Names and attributes must be accommodated to the essence of things, and not the essence to the names, since things come first and names afterwards.

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What has philosophy got to do with measuring anything? It's the mathematicians you have to trust, and they measure the skies like we measure a field.

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

Nature doth, and in it alone is discovered an infinite wisdom, so that Divine Wisdom may be concluded to be infinitely infinite.

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Attribution

Quote text and notes from Wikiquote: Galileo Galilei (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.