The Analects (Lun Yu) is a collection of Confucius' sayings and conversations, compiled by his disciples after his death (479 BCE).
Ren is the highest virtue in Confucianism — often translated as "human-heartedness" or "benevolence." Confucius said: "To overcome yourself and return to ritual is ren." Practicing ren: be respectful, tolerant, trustworthy, diligent, and kind.
Li is the proper way of doing things — rituals, etiquette, social norms. It's not empty formality; it's the outward expression of inner virtue.
Ruler-minister, father-son, husband-wife, elder brother-younger brother, friend-friend. Each has mutual obligations: the elder protects, the younger respects.
"Is it not a pleasure to learn and practice at the right time?" "Do not do to others what you do not want done to yourself." "He who knows his purpose has no anxiety; he who is wise has no doubt; he who is brave has no fear."