A person who knows all the answers, has an opinion on everything, has a certainty backed up by rational argument, has very little possibility of further progress. Such a person is unlikely to walk away from a discussion with anything more than a reaffirmation of how right he or she has been all along.
Edward de BonoUnfortunately, our existing traditional thinking habits insist that you must attack something and show it to be bad before you can suggest a change. It is more difficult to acknowledge that something is excellent and then to ask for change because although it is excellent, it is not enough.
Edward de BonoAn idea that is developed and put into action is more important than an idea that exists only as an idea.
Edward de Bono