I think you mean 'enlightened self-interest'. This is the idea
that we do not have to be greedy and selfish to get what we want
out of life, which is the approach taken by those with a rather
unenlightened view. Rather, if we each act in a spirit of mutual
cooperation, ethical duty and service to others, then that will
tend to be reciprocated, and we all benefit in the long run. In
other words, you can serve your own interests by considering and
serving the interests of others.