To the best of my knowledge you can use anything as long as it is in what is known as the public domain. That might sound a bit complicated but the general rule of business is that you can not use work that belongs to someone else or is copywrite. You would need to check that out but my best guess would be that a Greek philosopher is likely to be in the public domain.If information is deemed to be in the public domain and therefore freely available - eg on a website, in a newspaper, magazine, phone directory or other freely available medium - you can replicate the information. For example, if you wish to have a list of eating places at your website, or a list of banks or chemists in your hotel bedrooms, you are allowed to take information which is published in say a telephone directory, newspaper, or other website, and reproduce it in an appropriate format.You are not allowed to replicate directly personal information (like the home address of a florist s proprietor) but you can replicate the publicly available information (like the contact details of the florist business, and the opening times, for example). Never publish obviously personal or sensitive data, irrespective of whether you found it in the public domain.
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Its perfectly legal in my country, but I think you would have to put his name behind the quote. Or if it is an more unknown guy, screw him and just print the name.
