Warren Buffett points out that it is important to invest in oneself. Learning about oneself empowers him or her to lead a meaningful life. This valuable investment should focus on better communication that leads to exponential returns. Buffett mentions Dale Carnegie's timeless bestseller, "How to win friends and influence people", which emphasizes the importance of speaking confidently to express one's own thoughts and ideas in public. This skill enables Buffett to sell stocks more easily when he has to do so later in his financial career.

Another important life lesson from Carnegie suggests that one should never engage in a hot debate with others. A hot debate not only alienates both sides but also reinforces each other's strong views and opinions. It is more important to learn to be cooperative and collegial with others. Close collaboration and teamwork can accomplish much more than personal warfare, retaliation, and conflict entrenchment. We should learn these wise life lessons to be open and positive in a broader team context where every team player wins. Trust trumps disagreement in most positive interpersonal interactions.