According to Matthew Arnold, John Milton is a poet who demonstrates "high seriousness" and moral grandeur.
In The Study of Poetry (1880), Arnold praises Milton for his sublime style, moral depth, and philosophical vision. He sees Milton’s works, especially Paradise Lost, as embodying the dignity, truth, and elevated purpose that define truly great poetry. Milton’s majestic language and deep engagement with profound moral and religious themes make him a prime example of Arnold’s ideal poet.
Alongside Milton, Arnold also recognizes Homer and Dante as poets who exemplify "high seriousness" in their works.