Everyone has the right to doubt everything as often as he pleases and the duty to do it at least once. No way of looking at things is too sacred to be reconsidered. No way of doing things is beyond improvement.
Edward de BonoThis new meta-system is very much in favor of the self, but a self that is based on a proper sense of dignity, not on an inflated ego. A person who dare not admit he is wrong inflates his ego but weakens his self.
Edward de BonoA 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 Bono