Solipsism is the philosophy that your mind is the only thing you can be sure exists.
1. You can’t trust your senses. Your physical senses are infallible to begin with and are easily fooled. So you cannot trust anything you feel, see, taste, smell, or hear.
2. You can’t even really trust in reason, since people are fallible and can be misled in that regard as well. Not to mention that, dreams are false, yet when we dream we think they are true, you can’t be sure that what you perceive or reason now isn’t as fictitious as a dream.
Thus the only thing you can be sure of is that your mind exists. Because, true or false, your thoughts exist, ergo your mind must exist to produce them, for if your mind did not exist, you would not have thoughts to consider the proposition in the first place.
You think, therefore you are.
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