Ayn Rand said...

Achievement of your happiness is the only moral purpose of your life, and that happiness, not pain or mindless self-indulgence, is the proof of your moral integrity, since it is the proof and the result of your loyalty to the achievement of your values.

and then she said this:

It only stands to reason that where there is sacrifice, there is someone collecting the sacrificial offerings.
where there is service there is someone being served.
The man who speaks to you of sacrifice
is speaking of slaves and masters, and intends to be the master.