Wisdom is developed only in experience. No matter how hard they study, the graduate of medical school, law school, and business school will become truly wise in their fields only out in the open, that is, in real-life experince.
Tim Keller, God’s Wisdom for Navigating Life
This explains well the reason that I have a difficult time listening to the “wisdom” of someone in their twenties and maybe even their thirties. Wisdom comes from experience and experience is hard-earned and expensive.