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See now the power of truth; the same experiment which at first glance seemed to show one thing, when more carefully examined, assures us of the contrary.

— Galileo Galilei Dialogues and Mathematical Demonstrations Concerning Two New Sciences (1638)

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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.

Discoveries and Opinions of Galileo (1957)

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.

Dialogo sopra i Due Massi Sistemi del Mondo (1632)

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