How does Valjean repay the Bishop’s kindness the next morning? Support your answer with textual evidence.

A brigadier of gendarmes, who seemed to be in command of the group, was standing near the door. He entered and advanced to the Bishop, making a military salute. "Monseigneur--" said he. At this word, Jean Valjean, who was dejected and seemed overwhelmed, raised his head with an air of stupefaction.