Descartes

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“One cannot conceive anything so strange and so implausible that it has not already been said by one philosopher or another.”
—René Descartes (1596–1650)

“... moral certainty is certainty which is sufficient to regulate our behaviour, or which measures up to the certainty we have on matters relating to the conduct of life which we never normally doubt, though we know that it is possible, absolutely speaking, that they may be false.”
—René Descartes (1596–1650)

“it is not possible for there to be in us any thought of which, at the moment it is in us, we are not conscious.”
—René Descartes (1596–1650)