L. Frank Baum

“ Louise inquired.
"Always," was the laughing reply. "It's an odd expression—isn't it?—to dwell forever on a man's face. But Tom is never angry, or hurt or excited by anything, so there is no reason he should not smile. At the time of Captain Wegg's death and poor grandfather's terrible affliction, Old Hucks kept right on smiling, the same as ever; and perhaps his pleasant face helped to cheer us all."
Louise drew a long breath.
"Then the smile is a mask," she said, "and is assumed to conceal the man's real feelings."
"I do not think so," Ethel answered, thoughtfully. ”

“ The smile is habitual, and dominates any other expression his features might be capable of; but that it is assumed I do not believe. Thomas is a simple-minded, honest-hearted old fellow, and to face the world smilingly is a part of his religion. ”

“ I suppose?" hazarded Uncle John, remembering the brutal bellowing.
"Oh, not at all. He is fully paralyzed from his waist down, poor grandfather, and can do no harm to anyone. But often his outbreaks are unpleasant to listen to," continued the girl, deprecatingly, as if suddenly conscious that they had overheard the recent uproar.
"Has he been—this way—for long?" inquired Louise.
"His mind has been erratic and unbalanced since I can remember," answered Ethel, calmly, "but he first became violent at the time Captain Wegg died, some three years ago. ”