Galileo Galilei Quotes About Science

• Todas las verdades son fáciles de comprender una vez descubiertas; de lo que se trata es de descubrirlas.

  Galileo Galilei

  Inspiración, Verdad, Ciencia

  "Ángeles en el trabajo: historias e inspiraciones para crear un nuevo mundo laboral". Libro de Melissa Giovagnoli, 1999.

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

  Galileo Galilei

  Aprendizaje, Ciencia, Descubrimiento

• En cuestiones de ciencia, la autoridad de mil no vale el humilde razonamiento de un solo individuo.

  Galileo Galilei

  Truth, Inspiration, Independent

  "Biographies of Distinguished Scientific Men". Book by François Arago, as translated by Baden Powell, Robert Grant, and William Fairbairn, p. 365, 1859.

• Philosophy [nature] is written in that great book which ever is before our eyes -- I mean the universe -- but we cannot understand it if we do not first learn the language and grasp the symbols in which it is written. The book is written in mathematical language, and the symbols are triangles, circles and other geometrical figures, without whose help it is impossible to comprehend a single word of it; without which one wanders in vain through a dark labyrinth.

  Galileo Galilei

  Philosophy, Book, Mean

• La Biblia muestra el camino para ir al cielo, no el camino de los cielos.

  Galileo Galilei

  Ciencia, Cielo, Camino

• No me siento obligado a creer que el mismo Dios que nos ha dotado de sentidos, razón e intelecto haya querido que renunciemos a utilizarlos.

  Galileo Galilei

  Espiritual, Ateo, Creer

  "Carta a la Gran Duquesa Cristina". Ensayo de Galileo Galilei, 1615.

• Take note, theologians, that in your desire to make matters of faith out of propositions relating to the fixity of sun and earth you run the risk of eventually having to condemn as heretics those who would declare the earth to stand still and the sun to change position-eventually, I say, at such a time as it might be physically or logically proved that the earth moves and the sun stands still.

  Galileo Galilei

  Running, Moving, Science

  Galileo Galilei (1967). “Dialogue Concerning the Two Chief World Systems, Ptolemaic and Copernican, Second Revised Edition”, p.5, Univ of California Press

• The vain presumption of understanding everything can have no other basis than never having understood anything. For anyone who had ever experienced just once the perfect understanding of one single thing, and had truly tasted how knowledge is accomplished, would recognize that of the infinity of other truths he understands nothing.

  Galileo Galilei

  Science, Perfect, Understanding

  Galileo Galilei (1967). “Dialogue Concerning the Two Chief World Systems, Ptolemaic and Copernican, Second Revised Edition”, p.101, Univ of California Press

• By denying scientific principles, one may maintain any paradox.

  Galileo Galilei

  Science, Religion, Principles

• Mathematics is the key and door to the sciences.

  Galileo Galilei

  Knowledge, Science, Keys

  Attributed to Galileo Galilei in "Building Fluency Through Practice and Performance" by Timothy Rasinski and Lorraine Griffith (p. 64), 2008.

• El gran libro de la naturaleza está escrito en matemáticas.

  Galileo Galilei

  Book, Math, Science

• I think that in the discussion of natural problems we ought to begin not with the Scriptures, but with experiments, and demonstrations.

  Galileo Galilei

  Science, Thinking, Scripture

  "Pale Blue Dot". Book by Carl Sagan (p. 43), 1994.

• Pero lo que supera todas las maravillas, he descubierto cuatro nuevos planetas y observado sus movimientos propios y particulares, diferentes entre sí y de los movimientos de todas las demás estrellas; y estos nuevos planetas se mueven alrededor de otra estrella muy grande [Júpiter] como Venus y Mercurio, y tal vez los otros planetas conocidos, se mueven alrededor del Sol. Tan pronto como este tratado, que enviaré a todos los filósofos y matemáticos como anuncio, esté terminado, enviaré una copia al Serenísimo Gran Duque, junto con un excelente catalejo, para que pueda verificar todas estas verdades.

  Galileo Galilei

  Stars, Moving, Science

  "Sidereus Nuncius, Or The Sidereal Messenger". Book by Galileo Galilei, March 13, 1610.

• Spots are on the surface of the solar body where they are produced and also dissolved, some in shorter and others in longer periods. They are carried around the Sun; an important occurrence in itself.

  Galileo Galilei

  Science, Important, Body

• I cannot but be astonished that Sarsi should persist in trying to prove by means of witnesses something that I may see for myself at any time by means of experiment. Witnesses are examined in doutbful matters which are past and transient, not in those which are actual and present. A judge must seek by means of witnesses to determine whether Peter injured John last night, but not whether John was injured, since the judge can see that for himself.

  Galileo Galilei

  Verdad, Significado, Ciencia

• Por lo tanto, concluí, y decidí sin vacilar, que hay tres estrellas en los cielos que se mueven alrededor de Júpiter, como Venus y Mercurio alrededor del Sol; lo que finalmente fue establecido tan claro como la luz del día por otras numerosas observaciones.

  Galileo Galilei

  Stars, Moving, Science

  "The English Renaissance: An Anthology of Sources and Document". Book by Kate Aughterson (p. 383), June 1, 2002.

• We see only the simple motion of descent, since that other circular one common to the Earth, the tower, and ourselves remains imperceptible. There remains perceptible to us only that of the stone, which is not shared by us; and, because of this, sense shows it as by a straight line, always parallel to the tower, which is built upright and perpendicular upon the terrestrial surface.

  Galileo Galilei

  Science, Simple, Towers

• It reveals to me the causes of many natural phenomena that are entirely incomprehensible in the light of the generally accepted hypotheses. To refute the latter I collected many proofs, but I do not publish them ... I would dare to publish my speculations if there were people men like you.

  Galileo Galilei

  Science, Men, Light

  Letter to Johannes Kepler, 1596.

• Entre los grandes hombres que han filosofado sobre [la acción de las mareas], el que más me ha sorprendido es Kepler. Era una persona de genio independiente, [pero] se interesó por la acción de la luna sobre el agua, y por otros fenómenos ocultos, y chiquilladas similares.

  Galileo Galilei

  Independiente, Ciencia, Luna

• Me gustaría, mi querido Kepler, que pudiéramos reírnos juntos de la extraordinaria estupidez de la chusma. ¿Qué piensa usted de los principales filósofos de esta Universidad? A pesar de mis repetidos esfuerzos e invitaciones, se han negado, con la obstinación de una víbora glotona, a mirar los planetas o la Luna o mi cristal [telescopio].

  Galileo Galilei

  Science, Thinking, Moon

• When the moon is ninety degrees away from the sun it sees but half the earth illuminated (the western half). For the other (the eastern half) is enveloped in night. Hence the moon itself is illuminated less brightly from the earth, and as a result its secondary light appears fainter to us.

  Galileo Galilei

  Ciencia, Luna, Noche

• Their vain presumption of knowing all can take beginning solely from their never having known anything; for if one has but once experienced the perfect knowledge of one thing, and truly tasted what it is to know, he shall perceive that of infinite other conclusions he understands not so much as one.

  Galileo Galilei

  Knowledge, Science, Knowing

• Oh, mi querido Kepler, cómo me gustaría que pudiéramos reírnos a carcajadas juntos. Aquí, en Padua, está el principal profesor de filosofía, a quien he pedido repetida y urgentemente que mire la luna y los planetas a través de mi cristal [telescopio], cosa que él se niega pertinazmente a hacer. Y oír al profesor de filosofía de Pisa esforzarse ante el gran duque con argumentos lógicos, como con encantamientos mágicos, para hacer desaparecer del cielo los nuevos planetas.

  Galileo Galilei

  Laughter, Philosophy, Science

• Science proceeds more by what it has learned to ignore than what it takes into account.

  Galileo Galilei

  Science, Accounts

• 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. ... [D]emonstrated 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.

  Galileo Galilei

  Wise, Nature, Father

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