Final answer:
The first quatrain of "Sonnet 75" implies that writing grants immortality to individuals by preserving their essence beyond death, reflecting a Romantic view of art's power.
Step-by-step explanation:
The central idea of the first quatrain in "Sonnet 75" suggests that writing allows people to achieve a form of immortality, living on through their words even after death. This theme is a common one in literature, especially within the Romantic period where poets often explored the idea of transcending the natural world and the limits of time through art. It emphasizes the power of the written word to preserve legacies and emotions beyond the physical lifespan of the writer, aligning with the Romantic concept of the artist imbuing their creations with a spark of their own genius.