Final answer:
Keats uses 'A censer swinging with fragrant smoke' as religious imagery to express his devotion to Psyche, connoting sacred rituals and divine offerings, elevating her to a deity-like status.
Step-by-step explanation:
One example of religious imagery John Keats uses to express his devotion to the mythological figure Psyche in literature is "A censer swinging with fragrant smoke". This symbol is imbued with religious connotations, typically associated with liturgical ceremonies and divine offerings. In essence, it conjures the image of a sacred ritual, which could be interpreted as aligning with Keats's adoration of Psyche and his elevation of her to a deity-like status. In his poem, Keats desires to establish a new world of imagination where Psyche is worshipped, using such religious imagery to echo the sanctity and reverence he feels towards her, akin to a worshiper in the context of spirituality.