After M. Gillenormand turns Marius out of his home, how does Marius continue to change as a young man on his own in Victor Hugo's Les Misérables?

In Book 5 of Victor Hugo's Les Miserables, after Marius's political views changed, leading his grandfather M. Gillenormand to dismiss him from the household, Marius becomes a very caring, independent person, able to deal with poverty.

We particularly see Marius's caring nature when he learns from the old woman he pays to clean his room that the poor family who lives in his building, the Jondrettes, will be evicted for being 20 francs behind on their rent. Marius gives the woman 25 out of 30 francs he has saved to pay for the family's rent and to give them a little extra:

"Here," he said to the old woman, "take these twenty-five francs. Pay for the poor people and give them five francs, and do not tell them it was I." (Bk. 5, Ch. 4)

He also learns to deal with poverty. Though his aunt sends him money each month, per his grandfather's instructions, Marius refuses it, preferring instead to make it on his own. On his own, he studies law and is admitted to the bar. With the help of his friend Courfeyrac, Marius gets a job in a publishing house that earns him 700 francs a year.