This chengyu is considered quite formal and literary, but it is widely understood. You'll hear it in serious discussions, see it in news articles, and find it in literature.
Analyzing Problems (Most Common Use): This is its primary function. When people want to explain that a current crisis has deep roots, they use this proverb. It's a way of saying, “Don't just look at the latest event; the real cause goes way back.”
*Examples:* Discussing a divorce, a company's failure, societal issues, or a long-standing political conflict.
Encouraging Patience (Less Common Use): In a positive context, it can be used to praise someone's long-term effort or to encourage someone to be patient with a slow-developing skill. It reminds them that mastery takes time.