How do I know what I know? Rene Descartes altered the course of philosophy by raising this question. Descartes’ method of doubt questioned beliefs, both scientific and religious, that could be known with utter certainty. Descartes was able to show most of our, scientific, mathematical, religious, and everyday beliefs really cannot stand up to that kind of assessment.
This systematic doubt brought an issue that philosopher would debate upon for decades to come. Do we learn about the nature of things, through our physical senses or by logic or reasoning? A great philosopher by the name of Immanuel Kant tried to resolve this issue. He argued that we in fact never have understanding of reality but only of things as they appear to us, and that the mind itself supplies the form in which we know appearances.
What do I think of all this? Even before I took this class, I often wondered about my and others’ perceptions of reality. I used to think what if my entire life was a dream or a hallucination? How do I know if the things around me even exist and do they exist to others? It’s really terrifying to think about and I believe that the phrase ignorance is bliss truly sums up what I think about it. Would you want to know if you were a brain in a jar or would you rather continue believing that you are an organism who actually interacts with his environment? We would say a scenario like that is highly improbable but how do we know?