What is the second lesson?

The Captain delves deeper into the unfairness of life and death. Albom imbues this character's philosophy with Eastern thought and Christian motifs to remind Eddie (and the reader) that bad things happen to good people and there are no universal laws governing the human perception of justice. The Captain died after stepping on the land mine, but the four other soldiers would have also died if the truck had rolled over it. Here, the Captain emphasizes the (here is the lesson) importance of looking at sacrifice as an aspiration rather than a regret. The Captain forces Eddie to accept the fact that life unfolds in unpredictable ways, but he is not able to tell Eddie about the fate of the girl he tried to save at Ruby Pier.