Quote by Thomas A. Edison
Anything that won't sell, I don't want to invent. Its sale is proof of utility, and utility is success.

Summary
This quote suggests that the speaker has a practical approach towards inventing things. They believe that if something doesn't have a market demand or won't sell well, there is no point in creating or inventing it. According to them, the sale and success of a product are indications of its usefulness or utility. Therefore, they prioritize creating things that have a potential market and prove their value through successful sales.