Being

Now I'm reading a book written about Heidegger. In this book, the very famous book, Being and Time, is discussed in this book.
Existence of something, this has been one of the biggest issue to be discussed for a long time, and so many philosopher have had many quote. One of the most famous one is, cogito ergo sum, in Latin; I think therefore I am, in English, by Descartes.
No one can argue that he or she exists for 100 percent, because the reason or the probe is placed based on our existence.
Some years ago, there was a movie that deals the perception of existence, named The Matrix. The concept is absolutely interesting.
Anyway, proving our existence is one of the biggest issue for us and philosophy.