In his final exhortation, Biden is asked by the press why he's so optimistic about America's chances in the world. His answer is simple: this generation. He tells the Class of 2021 that they represent the best of what America can be — more educated, more tolerant, more open than any generation before them. It's both a compliment and a charge: the country needs them badly, and their readiness to serve in a diversifying, increasingly complex world is what gives him confidence in the future.