“We must doubt the certainty of everything which passes through the senses, but how much more ought we to doubt things contrary to the senses, such as the existence of God and the soul.”

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Leonardo Da Vinci 363
Italian Renaissance polymath 1452–1519

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“If there is a sense of reality, there must also be a sense of possibility. To pass freely through open doors, it is necessary to respect the fact that they have solid frames. This principle, by which the old professor had lived, is simply a requisite of the sense of reality. But if there is a sense of reality, and no one will doubt that it has its justifications for existing, then there must also be something we can call a sense of possibility. Whoever has it does not say, for instance: Here this or that has happened, will happen, must happen; but he invents: Here this or that might, could, or ought to happen. If he is told that something is the way it is, he will think: Well, it could probably just as well be otherwise. So the sense of possibility could be defined outright as the ability to conceive of everything there might be just as well, and to attach no more importance to what is than to what is not.”

The Man Without Qualities (1930–1942)
Variant: If there is a sense of reality, there must also be a sense of possibility. To pass freely through open doors, it is necessary to respect the fact that they have solid frames. This principle, by which the old professor had lived, is simply a requisite of the sense of reality. But if there is a sense of reality, and no one will doubt that it has its justifications for existing, then there must also be something we can call a sense of possibility. Whoever has it does not say, for instance: Here this or that has happened, will happen, must happen; but he invents: Here this or that might, could, or ought to happen. If he is told that something is the way it is, he will think: Well, it could probably just as well be otherwise. So the sense of possibility could be defined outright as the ability to conceive of everything there might be just as well, and to attach no more importance to what is than to what is not.

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“To believe with certainty we must begin with doubting.”

Stanisław Leszczyński (1677–1766) king of Poland

No. 61.
Maxims and Moral Sentences

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“We absolutely must leave room for doubt or there is no progress and no learning. There is no learning without having to pose a question. And a question requires doubt. People search for certainty. But there is no certainty. People are terrified — how can you live and not know?”

It is not odd at all. You only think you know, as a matter of fact. And most of your actions are based on incomplete knowledge and you really don't know what it is all about, or what the purpose of the world is, or know a great deal of other things. It is possible to live and not know.
from lecture "What is and What Should be the Role of Scientific Culture in Modern Society", given at the Galileo Symposium in Italy (1964)
The Pleasure of Finding Things Out (1999)

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“Highly ought we to rejoice that God dwelleth in our soul, and much more highly ought we to rejoice that our soul dwelleth in God. Our soul is made to be God’s dwelling-place; and the dwelling-place of the soul is God, Which is unmade.”

Julian of Norwich (1342–1416) English theologian and anchoress

And high understanding it is, inwardly to see and know that God, which is our Maker, dwelleth in our soul; and an higher understanding it is, inwardly to see and to know that our soul, that is made, dwelleth in God’s Substance: of which Substance, God, we are that we are.
And I saw no difference between God and our Substance: but as it were all God; and yet mine understanding took that our Substance is in God: that is to say, that God is God, and our Substance is a creature in God.
Summations, Chapter 54

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“We never know through what Divine mysteries of compensation the great Father of the universe may be carrying out His sublime plan; but those three words, "God is love" ought to contain, to every doubting soul, the solution of all things.”

Dinah Craik (1826–1887) English novelist and poet

Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 270

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“Our doubts about ourselves cannot be banished except by working at that which is the one and only thing we know we ought to do.”

Eric Hoffer (1898–1983) American philosopher

Entry (1955)
Eric Hoffer and the Art of the Notebook (2005)
Context: Our doubts about ourselves cannot be banished except by working at that which is the one and only thing we know we ought to do. Other people's assertions cannot silence the howling dirge within us. It is our talents rusting unused within us that secrete the poison of self-doubt into our bloodstream.

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“It seems to me absurd to doubt that a man may be an ardent Theist & an evolutionist. … I have never been an atheist in the sense of denying the existence of a God.”

Charles Darwin (1809–1882) British naturalist, author of "On the origin of species, by means of natural selection"

Letter http://www.darwinproject.ac.uk/letter/entry-12041 to John Fordyce, 7 May 1879
Other letters, notebooks, journal articles, recollected statements

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