She continued her own studies, principally attending to German, and to Literature; and every Sunday she went alone to the German and English chapels. Her walks too were solitary, and principally taken in the allée défendue, where she was secure from intrusion. This solitude was a perilous luxury to one of her temperament; so liable as she was to morbid and acute mental suffering.
Elizabeth Gaskell, The Life of Charlotte Brontë
mental-health