Define filial piety. Why is it the “source of all virtues” in Confucianism?

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Filial piety is the virtue of respecting and honoring one's parents and ancestors. In Confucianism, it is considered the "source of all virtues" because it forms the foundation of a harmonious society and teaches individuals to prioritize family relationships and fulfill their duties to their elders.

Shorter

Respecting parents and ancestors is filial piety, which is the foundation of all virtues in Confucianism.