jin4 zhu1 zhe3 chi4, jin4 mo4 zhe3 hei1
Translation: He who stays near vermilion gets stained red; he who
stays near ink gets stained black.
Explanation: If one hangs out with the right group of friends, one
be healthy physically and mentally. If one hangs out with the wrong
group of friends, one may not be healthy physically and
mentally.
Note: The explanation is very bad, hope someone can correct it.
