How does justine show her goodness?

In court, Justine stands calmly before her accusers; her solemn face lends her an exquisite beauty. Justine, called to the witness stand, provides another account of the events: with Elizabeth's permission, she had passed the night of the murder at her aunt's house in Chêne. Upon hearing of William's disappearance, she spent several hours searching for him; unable to return home, as it had grown too late, she determined to spend the night in a nearby barn. Shockingly, Justine confesses to the murder, and expresses a wish to see Elizabeth, who asks Victor to accompany her. Justine tells them that she confessed to a lie in order to obtain absolution and avoid excommunication in her last moments. She does not fear death, and nobly spends her last moments in comforting Elizabeth and Victor. This only serves to heighten Victor's anguish, and he reflects that Justine and William are the first victims of his "unhallowed arts."