Self-interest is grounded in the idea that man is an end in himself, not the means to the ends of others.
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Self-interest is admirable. Man must exist for his own sake, neither sacrificing himself to others nor sacrificing others to himself.
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Self-interest , when exercised, frequently promotes the interest of the society more effectually than when he really intends to promote it.
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Self-interest is an ethical issue. The evil of a robber does not lie in the fact that he pursues his own interests, but in what he regards as to his own interest.
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Self-interest is not myopic selfishness. It is whatever it is that interests the participants, whatever they value, whatever goals they pursue.