belles lettres (noun)

1. The poet's love letters were regarded as belles lettres, filled with passionate expressions of affection.

2. The sacred scriptures are often considered as belles lettres, as they contain profound spiritual teachings and insights.

3. Many classic novels and poetry collections are regarded as belles lettres, admired for their artistic and literary qualities.

4. The chilling tales of supernatural occurrences and mysterious events in the Gothic novel are examples of belles lettres in the horror genre.