What does Proverbs 1:18 mean?

Solomon reinforces the concept that those who plan to do evil will undoubtedly harm themselves. These people are out for selfish gain, and they will meet a selfish end. The trap that they set for others, in the end, will tangle them up. This is a major theme of biblical morality: nobody "gets away with it." Trying to get ahead by defying God will only lead to disaster (Mark 8:36). All sin will be punished, and only the gospel gives us a means to avoid the fate we deserve.

In a more immediate context, Solomon is highlighting the fact that getting involved with sinners leads only to personal destruction. Falling into the temptations of sin never ends well, even when it seems to start well. No good can come from these wicked plans. Both the book of Proverbs and other Scriptures will emphasize the importance of choosing one's company very carefully (Proverbs 13:20; 1 Corinthians 15:33).