Since saints, at least in Catholicism, are designated as such in part because of their Christian manner of living, children can derive benefit from individual saints being presented as models of particular virtues. Examples are St. Joseph and honor, St. Maria Goretti and purity and St. Thomas Aquinas and study.
Catholic tradition honors St. Joseph to be the chaste husband of Mary and as the foster father of Jesus Christ. As head of the holy family, he had the task of providing for and looking after Mary and Jesus. The Bible records his high sense of honor when he found out that Mary (with whom he was engaged) was pregnant with a child that could not have come from him. The Jewish law at the time permitted stoning unfaithful women to death. Despite this, St. Joseph decided to divorce her quietly and not bring shame upon her, until the Lord came to him to inform him that the child was actually conceived by a miracle and that he should marry Mary.
St. Maria Goretti was an Italian girl who lived in the 19th and early 20th centuries. When she was 12 years old, a neighbor boy attempted to rape her. Having committed herself to purity, she stated that she would rather die than perform sexual acts, and for this she was murdered. The Catholic Church today holds her as a model of purity, especially for young women.
St. Thomas Aquinas is the patron saint of students, because he devoted his life to studying and exploring the truth about God and world. Teachers can use this saint's life to teach children about the virtues of patience, attention to detail and hard work.