This raises several questions, however. For instance, is it acceptable that a person only deceives another if he is weak or malicious? or, can a person not deceive another person even if he is more powerful, and/or even if she is not being malicious? Cannot it not be that there exists a more powerful, and non-malicious, deceiver? So basically, for Descartes, God is an entity that cannot lack in anything; and

And on the same principle, although these general objects, viz. [a body], eyes, a head, hands, and the like, be imaginary, we are nevertheless absolutely necessitated to admit the reality at least of some other objects still more simple and universal than these, of which, just as of certain real colors, all those images of things, whether true and real, or false and fantastic, that are found in our consciousness

Carrying it to the next logical step, he says that all opinions are false until proven otherwise, and perhaps it is not he himself who is responsible for his own deception, but rather it is "some deceitful demon" who is so clever and capable that he can blur the reality of "the sky, the air, the earth" into a dream or illusion. Meantime, Williams writes that Descartes is the kind of

If at the moment of stating this theory, animals were simply regarded as mindless creatures, their current status has changed. A large number of organizations received state funds to investigate the lives of animals and came up with astonishing results. The researches developed concluded that most animals had a very active brain and could reach high level of intelligence and communication skills. As such, even if a large part

Spinoza defines "substance" as "what is in itself and is conceived through itself, i.e. that whose concept doesn't have to be formed out of the concept of something else." He defines "attribute" as "what the intellect perceives of a substance as constituting its essence." Spinoza sets up his argument for the nondivisibility of God by establishing that substances are exclusive. In Proposition 2, he establishes that "Two substances having different

The object still exists as well, even if it only perceived inaccurately by the material world and by the sensations Mathematical proofs and mathematical calibrations are accurate, when correctly done, according to Descartes, because they can be proven by logic that the existence of such things exist with tools outside of the body. But although Descartes' Christian world of a non-deceitful god may have been persuasive to his readers, a