Thus have I heard:
One time, the Budha was staying at Anaathapindidas Ashrama in Jetavana of Shraavastii.
At that time, Bhagavaan addressed the Bhikshus: “If there is one person who appears in the world, the great darkness of ignorance is extinguished. At that time, ordinary foolish beings are bound by this ignorance, entangled in the cycle of birth and death, not knowing the true nature of reality. They wander through this life and the next, from one kalpa to another, without liberation.
When the Tathaagata, the Arhat, the Samyak-Sambudha appears in the world, the great darkness of ignorance is extinguished. Therefore, O Bhikshus, you should always remember to serve the Budhas. Thus, O Bhikshus, you should train yourselves.”
When the bhikshus heard what the Budha said, they followed it with joy.