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  4. Leonardo da Vinci
  5. We must doubt the certainty of everything which passes...

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.

Leonardo da Vinci
Soul, Doubt, Existence
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.