This quote is saying that it is more important to be someone who is valuable by contributing to the world in meaningful ways than it is to be someone who is seen as successful. To be successful is to find short-term and often material rewards, such as making money, winning awards, and having material possessions. However, being of value is to make significant positive changes that are long lasting and much more meaningful. This could include helping people in need, finding a way to make the world more sustainable, or working on medical treatments to save lives, for example. Being of value makes a more lasting impact on the world and others around you.