Question

[1]. Read the following passage carefully:

Passage: "Far out on a rocky point stood a lighthouse whose keeper, Joseph, kept a logbook in two colours. In black ink he wrote the weather, the ships and the state of the lamp; in blue ink he wrote what the sea had taught him that day. One stormy night the lamp flickered and the light went out. Joseph did not panic. He trimmed the wick, cleaned the lens with a cloth he had kept dry for just such a night, and relit the lamp before the next ship reached the rocks. Later he wrote in blue ink: 'A light is not kept by hoping; it is kept by preparing in calm weather for the storm.' Travellers never met Joseph, yet every safe arrival was, in a way, his greeting. The passage suggests that unseen, routine care often protects others more than dramatic rescue does." What is the main idea of the passage?