What is Power?A Reuters headline of 18 April 2014 reads ‘Powerful earthquake rattles Mexico, shakes buildings.’ The earthquake is powerful in that it overcomes the resistance of land and buildings. Isaac Asimov writes of inventor Johann Gutenberg: ‘he introduced printing as a powerful force in human affairs.’ Printing enables ideas to be widely disseminated, thereby initiating thoughts in people’s minds that would otherwise not have been initiated. The passive resistance offered by whatever else people were thinking is overcome by new ideas – ideas that originated in the mind of a writer. Even the active resistance of other people’s ideas may be overcome with different ideas. John Locke’s sub-title to his Two Treatises on Government reads, ‘The false principles and foundation of Sir Robert Filmer and his followers are detected and overthrown.’ Locke overthrows someone else’s principles, and replaces them with his own. The change takes place in readers’ minds as he convinces and persuades them using the power of intellect and imagination.