Regarding the questions you asked: self has really two
meanings, or is used in two senses, in the Baha'i writings; one is self, the
identity of the individual created by God. This is the self mentioned in such
passages as 'he hath known God who hath known himself etc.' The other self is
the ego, the dark, animalistic heritage each one of us has, the lower nature
that can develop into a monster of selfishness, brutality, lust and so on. It
is this self we must struggle against, or this side of our natures, in order to
strengthen and free the spirit within us and help it to attain perfection.
Self-sacrifice means to subordinate this lower nature and
its desires to the more godly and noble side of
ourselves. Ultimately, in its
highest sense, self sacrifice means to give our will and our all to God to do
with as He pleases. Then He purifies and glorifies our true
self until it becomes a shining
and wonderful reality. (From a letter
written on behalf of Shoghi Effendi to an individual believer, December 10, 1947;
compilation: Lights of Guidance)