Galileo Galilei Quotes


I would beg the wise and learned fathers (of the church) to consider with all diligence the difference which exists between matters of mere opinion and matters of demonstration. ... [I]t is not in the power of professors of the demonstrative sciences to alter their opinions at will, so as to be now of one way of thinking and now of another. ... Demonstrated conclusions about things in nature of the heavens, do not admit of being altered with the same ease as opinions to what is permissible or not, under a contract, mortgage, or bill of exchange.


Context

He was being pressured to recant some of his astronomical findings and demonstrations—especially the statement that the Earth revolved around the sun. (The church doctrine had it the other way around.) Here he seeks sympathy with his plight.


Citations

Galileo Galilei, 1564-1642, Italian Scientist, Letter to Cristina di Lorena, Grand Duchess of Tuscany, 1615

Sourced by: Eigen's Political and Historical Quotations

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Galileo Galilei
Galileo Galilei
  • Born: February 15, 1564
  • Died: January 8, 1642
  • Nationality: Italian
  • Profession: Scientist

Galileo di Vincenzo Bonaiuti de' Galilei was an Italian astronomer, physicist and engineer, sometimes described as a polymath, from Pisa. Galileo has been called the "father of observational astronomy", the "father of modern physics", the "father of the scientific method", and the "father of modern science".