Anything that won't sell, I don't want to invent. Its sale is proof of utility, and utility is success.
When you have exhausted all possibilities, remember this - you haven't.
When I have fully decided that a result is worth getting I go ahead of it and make trial after trial until it comes.
All bibles are man-made.
A good intention, with a bad approach, often leads to a poor result.
Whatever the mind of man creates, should be controlled by man's character.