• The very act of questioning whether you exist proves you do, because you must be there for the doubt to be entertained in the first place.

    Julian Baggini: The very act of questioning whether you exist proves you do, because you must be there for the doubt to be entertained in the first place.
    "Ideas for modern living: you" by Julian Baggini, www.theguardian.com. March 12, 2011.