Final answer:
One of the main themes of 'The Rime of the Ancient Mariner' is the blessedness of all living things, highlighting the importance of respecting and valuing life in its different forms.
Step-by-step explanation:
The main themes of “The Rime of the Ancient Mariner” touch upon various aspects of human existence, nature, and the supernatural. One of the most prominent themes in the poem is the blessedness of all living things, which suggests a deep reverence for life in its many forms. This theme is exemplified in the narrative when the Mariner realizes the grave mistake of killing the albatross and comes to understand the sanctity of all creatures after witnessing the beauty of the water-snakes and blessing them. The poem reflects on the Mariner's journey from ignorance to enlightenment, emphasizing the need for harmony with nature and respect for all living beings.