The phrase "pure heart" refers to a heart that is free from any impurities, such as greed, hatred or selfishness. It means having a sincere and honest intention in everything you do, with no hidden motives or ulterior motives. A person with a pure heart has good intentions towards others and acts with kindness, compassion and empathy. They are guided by their values and principles, and strive to treat everyone fairly and justly. In essence, having a "pure heart" means being honest, sincere, and genuine in your actions and interactions with others.