What does Proverbs 23:21 mean?

The prior verse warned against even being "among" those known for their excess and lack of self-control. Solomon pointed specifically to drunkenness and gluttony, but also implied all forms of uncontrolled urges. Not only can friends and associates influence our character (Proverbs 12:26; 13:20), but their choices can lead to troubles that sweep up innocent bystanders, as well (Proverbs 22:24–25).

This statement explains some of the consequences which come from uncontrolled excess. Those obsessed with the "party hard" lifestyle waste outrageous amounts of time and money on it. The same is true with any urge or desire that's marked by greed and addiction. This can lead to financial hardships, strained relationships, and trouble with employment. Substance addiction, especially, can ruin a person's ability to hold down a job.

An earlier teaching warned against being jealous of sinful lifestyles (Proverbs 23:17–18). Advertising always portrays alcohol as part of a fun time, but never points out how many people's lives have been ruined by drinking. Scripture doesn't forbid all use of alcohol, but it is clear about its dangers (Proverbs 23:29–35). The same is true of excessive eating, partying, substance abuse, or entertainment. If someone is controlled by their desires, those urges will push them towards personal disaster.