Monica asked:

How do I know I really exist and am not myself a dream?

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The story goes that Morris Raphael Cohen, the American philosopher, was asked by a student, "How
do I know that I exist?" Cohen's reply was, "Who's asking?" There is a lot in this reply of Cohen's
because it points out that the question you ask could not be asked unless you existed. "But what if I
only dream that I exist?" But isn't it true that in order for you to dream that you exist (or dream
anything at all) you must exist?

In a way, I am only repeating Descartes famous proof that he existed. He pointed out that he could
not doubt or question his existence unless he did exist.

Ken Stern