Try Again by Oliver Optic

By the time he reached the stable, Harry would have given almost anything to have recalled the hasty expressions he had used. He had acquired the low and vulgar habit of using profane language at the poorhouse. He was conscious that it was not only wicked to do so, but that it was very offensive to many persons who did not make much pretension to piety, or even morality; and, in summing up his faults in the woods, he had included this habit as one of the worst.

She hoped he was a good boy -- Julia Bryant, the little angel, hoped so. Her blood would have frozen in her veins if she had listened to the irreverent words he had uttered in the shop. He had broken his resolution, broken his promise to the little angel, on the first day he had been in the city. It was a bad beginning; but instead of permitting this first failure to do right to discourage him, he determined to persevere -- to try again.