The evil demon argument. I will suppose, then, not that Deity, who is sovereignly good and the fountain of truth, but that some malignant demon, who is.

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Presentation transcript:

the evil demon argument

I will suppose, then, not that Deity, who is sovereignly good and the fountain of truth, but that some malignant demon, who is at once exceedingly potent and deceitful, has employed all his artifice to deceive me; I will suppose that the sky, the air, the earth, colors, figures, sounds, and all external things, are nothing better than the illusions of dreams, by means of which this being has laid snares for my credulity…

…I will consider myself as without hands, eyes, flesh, blood, or any of the senses, and as falsely believing that I am possessed of these; I will continue resolutely fixed in this belief, and if indeed by this means it be not in my power to arrive at the knowledge of truth, I shall at least... guard with settled purpose against giving my assent to what is false, and being imposed upon by this deceiver, whatever be his power and artifice. -Descartes

The Dreaming Argument (1)I can’t be certain I’m not dreaming. (2)If (1), then I can’t know anything about the external world. (3)I can’t know anything about the external world.

The Evil Demon Argument (1)I can’t be certain I’m not being deceived by an evil demon. (2)If (1), then I can’t know anything about the external world. (3)I can’t know anything about the external world.

1)I can’t be certain I’m not being deceived by an evil demon. The Evidence Thesis : Our evidence for the external world is exactly the same as our evidence for the Evil Demon.

1)I can’t be certain I’m not being deceived by an evil demon. The Evidence Thesis : Our evidence for the external world is exactly the same as our evidence for the Evil Demon.

2)If (1), then I can’t know anything about the external world. The Knowledge Thesis : In order to know something you have to be certain (in the sense that you have to rule out all other possibilities).

The Evil Demon Argument (1)I can’t be certain I’m not being deceived by an evil demon. (2)If (1), then I can’t know anything about the external world. (3)I can’t know anything about the external world.