Another interesting aspect to this stuff, in many religions, is that loss of ego is equated with death. In some formulations, this can lead to the birth of soul, which has universal connections. However, for the radicals, as in some Buddhist groups, this is still too dualist - for them, everything collapses into a single reality, or maybe, not even that, (since it's another reification). What a laaf. The closest Christian version of this might be found in Eckhart, 'the only part of you that burns in hell is the part that won't let go of your life'. But Eckhart is hard.
(Should also mention Sufism, where 'fana' means death of self, or dying before one dies.)