The last section of Carnegie's book is about leadership — how to help people change, improve, and grow without destroying their dignity in the process. Here is the problem with direct criticism: most people will defend themselves, deflect, or shut down before they do anything useful with it. You get compliance at best. You rarely get commitment. Carnegie offers a different approach. Begin with praise. Before you raise a concern, name something real and true about what the person did well. This is not a trick — it is a signal that you see the whole person, not just their failure. It makes what comes next survivable. Never call out a mistake directly. Instead of: your presentation was disorganised, try: your content is strong — I wonder if a cleaner structure would let the ideas land even better. One is a verdict. The other is an invitation. If you need to criticise, make the person feel the error is easy to correct. The worst thing a leader or mentor can do is make someone feel like the mistake reflects who they are. It was a bad slide deck, not a bad person. Framing errors as situational and fixable produces action. Framing them as character flaws produces shame. Ask questions rather than giving orders. Instead of: do this by Friday, try: do you think this could be ready by Friday? The outcome may be the same, but the second version invites ownership. People follow through on decisions they feel they made. Let the person save face. Even if they were completely wrong, give them a path to dignity. Never humiliate someone in front of others. Private correction preserves the relationship. Public humiliation destroys it — and you lose the person. Carnegie's most important point in this section: praise every improvement. Even small ones. Especially small ones. Change happens in increments. If you only recognise the finished outcome, you miss every opportunity to reinforce the steps that get people there. Finally: make the person happy about doing what you suggest. Frame requests in terms of what they will gain, what they will learn, or how it fits their strengths. People move when they want to move.