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I therefore concluded, and decided unhesitatingly, that there are three stars in the heavens moving about Jupiter, as Venus and Mercury about the Sun; which at length was established as clear as daylight by numerous other observations. These observations also established that there are not only three, but four, erratic sidereal bodies performing their revolutions round Jupiter.

— Galileo Galilei

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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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