Why did Jean Valjean have such a lofty and admirable spirit of self-sacrifice?

I believe many of my friends have overlooked my tragic event. Les Miserables is a famous novel by Hugo. In China, many basic foreign books are Les Miserables, but when we were young, we probably didn't have a deep understanding of this novel, and we didn't know much about many of its storylines. When we read this novel when we grow up, we can often find many different things.

The protagonist of Les Miserables is Jean Valjean, who was sentenced to many years of criminal law for stealing a piece of bread in the play, which led to and then aroused doubts about the justice of their world and law. He kept retaliating against the society and running away. In the same process, he met many people at the bottom, was moved by their love and tolerance, and began to rethink the meaning of his existence.

It is the existence of these people that gave Jean Valjean the pursuit and yearning for a better life, so we saw it and then made him feel very noble. This job was brought to him by people who had helped him and tolerated him, although it made him a valuable asset, which was in sharp contrast with the dark rule of the bourgeoisie at that time.

Therefore, this is a very good novel, which is worth reading again. Every time I read it, I can find many different things. It is because this novel describes the contradictions of that era very deeply, and the sufferings and love of the people at the bottom are particularly vivid, which makes it easy for everyone to walk into that world and feel the existence of that world. I think this is very remarkable.