Concept
Stay the Course
3 books in the library reach for this idea - each in its own way. When independent authors converge on one concept, it usually deserves attention.
The Bogleheads' Guide to Investing
How this book uses it: The Bogleheads mantra. Don't panic sell during downturns; don't chase during bull markets.
The Little Book of Common Sense Investing
How this book uses it: Time in the market beats timing the market. Don't react to volatility.
The Simple Path to Wealth
How this book uses it: Markets crash. Don't sell. Historically, markets always recover. Panic selling is the wealth destroyer.