2. Regularly spending time with people is essential:

Spending quality time with the people we love is one of the easiest routes to happiness.

Danes are really good at making time for friends and family, with regular meals or time scheduled in together. It all stems back to the days when gathering food and wood were a crucial part of surviving...

Negative people tend to attract more negative people. Unhappy people like to have others indulge them while they wallow in self-pity. While we all will feel sad at times, staying unhappy can do more harm than good.

What to do about it: Choose your company. Sur...

This is the most important principle in Carnegie's book. It's about taking the time to learn about other people's interests and concerns. When you show genuine interest in someone, they're more likely to feel like you're paying attention to them and that you value their company.