I love a good one-line quote. They can be powerful and they can be useful when you need to reinforce a point whilst making a presentation or when you’re trying to make your case in a debate or argument. Here are 21 great, thought-provoking one-liners all of which certainly made me think. Thought-provoking one-liners: People may hear your words but they feel your attitude. ~John C. Maxwell The only source of knowledge is experience. ~Albert Einstein There is no substitute for hard work. ~Thomas A. Edison To travel is to discover that everyone is wrong about other countries. ~Aldous Huxley To be trusted