The phrase "great thing" is an expression that can be used to describe something positive, wonderful or beneficial. It could refer to a situation, event, object or idea that brings joy, satisfaction or value to someone's life. The term encompasses a wide range of experiences and emotions - from the thrill of achieving a personal goal to the happiness derived from spending time with loved ones. In essence, "great thing" is used to convey something that is highly appreciated or valued by an individual.