Like his sister, he is immersed in the criminal element of Paris, but while he uses it to his own ends for survival, he is untainted by it. He is "a compound" of "respect for authority and hatred of rebellion," Hugo writes, "but he made them almost evil by his exaggeration of them".
The wise words of J. He becomes a police inspector and has an absolute and unshakable belief in the law. Like Medieval philosophers, he believes that people will naturally resort to evil, and that these people can never be saved or reformed.
Hugo presents this side of Javert when he questions Sister Simplice, while looking for an escaped Valjean. Javert believes that all of those that live in poverty are destined to be criminals because they are forced to live without being able to satisfy certain wants, and that people, who are naturally bad, will violate the law to satisfy themselves.
The probability of children who carry his genes if not his name is significant enough to prevent him from denying support to women who claim to have his children. Eponine is the daughter of a known criminal, while Cosette is being foster-fathered by a secret one.
Perhaps the illustrator is suggesting that one man in complete control of the law represents an abuse of power. Eponine is a wretched creature who helps her parents steal, but she is eventually redeemed by her love for Marius.
Valjean notices that he is observed by a tall figure, which is revealed to be Javert.