The Second Meditation deals with reality and existence, like I mentioned before I thought that Descartes perhaps just too much time on his hands for thinking something so crazy as that everything around us is just an illusion and that we cannot trust out perception. I thought to myself that here is another philosopher saying something controversial just top be noticed but now that I was a little aware of a science called quantum physics and now I wonder if Descartes was actually someone who was way ahead of his time in thinking that everything is just an illusion and that what we perceive is actually false because quantum physics itself says that perhaps what we perceive as real, what our senses perceive as true my actually be false because it may just be an illusion created by our sense perception. With this in mind Rene Descartes is not crazy and his theory was not absurd this despite him being a member of the Rosicrucian group which believed in an invisible church that they built.Rene Descartes Philosophical theory on Existence and Reality was in fact a science which was way ahead of its time. His philosophy on doubting everything so as to arrive at certain knowledge can be seen as something radical and impractical and if we do take him literally then it is no doubt that this philosophy is indeed a radical form of Philosophy and an impractical one at that because one will just waste his time doubting and questioning everything one sees and this is just an impossible task. I think Rene Descartes is someone who was obsessed in knowing the truth and this led him to create this philosophy that before we can have certain knowledge we must first doubt. To have knowledge one must first doubt, this philosophy of Descartes becomes practical if we do not take to the extreme by really questioning everything, I think Descartes main point is that for man to use his reason rather than just accepting opinions, Descartes believes that reason is higher that any kind of opinion, Descartes wants us to use our reason and there is nothing radical about using our reason.