He may be your brother but he botches every job he's given.

Ruth wept much but Sara set her beauty to a fierce grimness which, even when, as you shall hear later, she was manumitted, she never entirely lost.

She looked with a grudging eye on this waste of life and beauty—there was none for him; and the sight of the coffin, with its deep black pall borne slowly along the glancing path, was a contrast of unutterable misery. It was a relief to change the cheerful meadow for the dark umbrage of the forest which they now entered.

The algorithm pops the stack to obtain a new current node when there are no more children (when it reaches a leaf).