I would beg the wise and learned fathers (of the church) to consider with all diligence the difference … - Galileo Galilei

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Whoever is careless with the truth in small matters cannot be trusted with important matters.

Galileo Galilei

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.

Demonstration, Difference, Father, Heavens, Nature, Wise

Same Author Quotes

Scripture is a book about going to Heaven. It's not a book about how the heavens go.

Book, Heaven, Going To Heaven, Scripture, Heavens

If you could see the earth illuminated when you were in a place as dark as night, it would look to you more splendid than the moon.

Nature, Dark, Moon, Night, Earth

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

Accounts, Ignore, Proceeds, Science, Takes

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.

Line, Science, Shared, Simple, Tower, Towers

It is surely harmful to souls to make it a heresy to believe what is proved.

Believe, Harmful, Orthodox, Soul, Souls