I came across ‘175 Great Quotes on Business, Entrepreneurship, Marketing and Sales’ on Slideshare, by Stephen Davis.
I particularly like these:
‘If you are not embarrassed by the first version of your product, then you’ve launched too late’
‘Customers buy on price because they can’t find extraordinary quality, convenience, service and value’
‘You cannot innovate by copying’
‘Learn to speak with the customers point of view’