His Aion book is very difficult. But the parallel that Jung draws between Christ and Buddha is interesting.
Christ too - like the Buddha - is an incarnation of the self, but in a very different sense. Both dominated the world in themselves: the Buddha, it could be said, through a rational understanding; the Christ, becoming a victim according to destiny; in Christianity, the main thing is to suffer, while in Buddhism the most important thing is to contemplate and do. Both are just, but in the Hindu sense the most complete man is the Buddha. He is a historical personality and, therefore, more understandable to man. Christ is, at the same time, a historical man and God, and therefore more difficult to access. Deep down, he knew only that he had to sacrifice himself, just as he had been forced from the bottom of his being. His sacrifice happened to him just as an act of fate. Buddha acted out of knowledge, lived his life and died in old age.