The sonnet opens with Milton addressing his Heavenly Father, expressing his gratitude for the many blessings he has received throughout his life, despite the challenges he now faces. He acknowledges that God has granted him "celestial light" in the form of intellectual and spiritual enlightenment, which has enabled him to pursue his poetic calling and serve as a vessel for divine inspiration.
However, Milton laments the loss of his physical sight, which he refers to as "light's absence." He acknowledges the limitations and inconveniences that blindness imposes on his daily life, including the inability to read, write, and enjoy the visual beauty of the world around him. He also expresses his frustration at being unable to fulfill his full potential as a poet, fearing that his blindness may hinder his ability to express his thoughts and emotions effectively.
Despite these challenges, Milton affirms his faith in God's providence and his belief that God has a greater purpose for him, even in his blindness. He draws comfort from the knowledge that God's "light within" still illuminates his mind and heart, enabling him to remain steadfast in his devotion and to continue his poetic work.
The sonnet concludes with Milton's declaration that, even though he may be physically blind, he will continue to seek and serve God with all his remaining senses and abilities. He expresses his hope that God will guide and inspire him, allowing him to use his blindness as an opportunity for spiritual growth and poetic transformation.
Overall, “On His Blindness” reveals Milton's profound sense of loss, his struggle with the limitations imposed by his physical condition, and his unwavering faith in God's plan for his life. The sonnet exemplifies Milton's resilience and determination, as well as his belief that even in the face of adversity, he can find meaning, purpose, and poetic inspiration.