17th-century British scholar Thomas Fuller said: "Knowledge makes good people better, and bad people worse. " Samuel Johnson said: "It is terrible to have knowledge without integrity. " Russell said: "Science is a kind of power, and any power can be good or bad. "And Einstein said more succinctly:" The knife is useful, but it can also be used to kill people. ". The most suitable title for this text is [>. ['Knowledge requires human control.', 'Knowledge is power.', 'Knowledge and ethics.', 'Knowledge is a knife.']