ESV.. 1Co 10:24 Let no one seek his own good, but the good of his neighbor.
To me this means look to the good (well being, needs) of you neighbor before thinking of yourself.
Just as the similar verses below tell us...
1Co 10:33 just as I try to please everyone in everything I do, not seeking my own advantage, but that of many, that they may be saved.
Rom 15:2 Let each of us please his neighbor for his good, to build him up.
Php 2:4 Let each of you look not only to his own interests, but also to the interests of others.
Fez's post in Did Paul Promote Envy and Theft? was marked as the answer