What metaphors are used in Memoirs of Hadrian by Marguerite Yourcenar?

Throughout the novel, Hadrian expresses an acute sense of pluralism when it comes to religion. He considers all deities to be part of a whole heaven. He even considers the once seditious cult of Jesus Christ to be a reasonable expression of a universal ideal. He equates Baal with Jupiter and Nirvana with the Plato's cave metaphor. He understands the etymology of faith with an unusually modern mindset.