I think, therefore I am, is the first and most certain truth that occurs to anyone who philosophizes in an orderly way.
Cogito ergo sum
Principles of Philosophy, Part I, Principle VII
1644
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"The light of natural reason is sufficient to give us a clear and distinct conception of God."
Controversial"Except our own thoughts, there is nothing absolutely in our power."
Strange & Unusual"It is proper to a philosopher to doubt everything, at least once."
Controversial"The greatest good for each of us is to live freely and happily."
Strange & Unusual"The chief cause of human error is the confused nature of our perceptions."
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