According to Frank Jackson, Mary did not know what it is like to see colors because she had been raised in a black-and-white room and had never experienced color vision.
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The only thing you know according to the phrase "the only thing I know is that I know nothing" is that you have awareness of your own ignorance.
According to Descartes, what you know best is your own existence. This is encapsulated in his famous phrase "Cogito, ergo sum" or "I think, therefore I am." Descartes argues that even if he were to doubt everything else, the fact that he is capable of doubting proves his existence as a thinking being.
The famous saying "One thing only I know, and that is that I know nothing" emphasizes the idea of humility and self-awareness, acknowledging that true knowledge comes from recognizing the limits of one's understanding.
Socrates believed that true knowledge comes from recognizing one's own ignorance. He famously proclaimed "I know that I know nothing." He valued critical thinking, questioning, and self-examination as the path to wisdom.
According to Kant, all of our future experiences will be in space and time because space and time are fundamental aspects of how our minds organize and perceive the world. Our experiences are shaped by the inherent structures of space and time, which are necessary for us to make sense of the world around us.