Final answer:
The occasion prompting Milton's thoughts in 'Sonnet 7: How soon hath Time, the subtle thief of youth' is his reflection on turning twenty-three and contemplating his life achievements in the face of time's swift passage.
Step-by-step explanation:
The occasion that leads John Milton to the thoughts in his poem Sonnet 7: How soon hath Time, the subtle thief of youth is the reflection on his age and the passage of time as he turns twenty-three years old. Milton expresses concern over his progress in life and his poetic achievements, contrasting his own sense of unfulfilled potential with the seemingly more successful lives of others. Despite these worries, Milton concludes with a resolve to trust in divine providence and to use his time and talents in service to his 'great Task-Master'.
While the themes of time, aging, and the urgency of life run through much early modern poetry, including works by William Shakespeare, the way Milton addresses these themes is deeply personal and reflective of his religious convictions and his ambitions as a poet. Other poets such as Andrew Marvell and William Wordsworth also grapple with the concept of time, youth, and the transient nature of life. Each poet brings their own perspective to the universal human experience of growing older and confronting one's mortality.