Here are some good quotes for helping explain lean thinking principles to people. They are not necessarily word for word accurate, but paraphrased for ease of understanding.
“If I don’t buy a new faster, better piece of plant as soon as it comes out then in six months time I’ve paid for it anyway but still don’t have it” – Henry Ford
“All we are doing is looking at the time line, from the moment the customer gives us an order to the point when we collect the cash. And we are reducing the time line by reducing the non-value adding wastes.” – Taiichi Ohno