Wing-tsit Chan’s “Humanism of Confucius”

Answer in one paragraph:

Based on Wing-tsit Chan’s “Humanism of Confucius” and course lectures, explain what it means to say that
– Confucianism is a form of humanism.
– What are the specific concepts that Confucianism employs to define a virtuous person and a flourishing, purposeful, life?
– What are the four virtues of ren 仁 (jen, benevolence)； li 禮 (ritual); and yi 義 (appropriate conduct).