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|summary= Who really knows what ''Cogito ergo sum'' means? Yes, you may know that Descartes said it, and that it translates as 'I think, therefore I am', but what was it the French philosopher was trying to say about human existence when he said this most quotable and definitive phrase? And, for that matter, ''where'' did he say it? Was it in the seventeenth century or the eighteenth? If these are the sort of question that keep you awake at night, then Gary Cox's ''Deep Thought: 42 Fantastic Quotes that Define Philosophy'' will be a welcome addition to your library. |amazonuk=<amazonuk>1472567269</amazonuk>

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|author=C J Skuse

|title=Monster