Remember: the greatest danger you face in the world today is that you are replaceable. As you get older, people who are younger, cheaper and more in … - Robert Greene

Become who you are by learning who you are.

Perhaps you are not trying to whip a crowd into a frenzy; you just want to bring people over to your side. Choose your strategy and words carefully. You might think it is better to reason with people, explain your ideas. But it is hard for an audience to decide whether an argument is reasonable as they listen to you talk. They have to concentrate and listen closely, which requires great effort. People are easily distracted by other stimuli, and if they miss a part of your argument, they will feel confused, intellectually inferior, and vaguely insecure. It is more persuasive to appeal to people’s hearts than their heads. Everyone shares emotions, and no one feels inferior to a speaker who stirs up their feelings. The crowd bonds together, everyone contagiously experiencing the same emotions.

There is almost a touch of condescension in the act of hiring friends that secretly afflicts them. The injury will come out slowly: A little more honesty, flashes of resentment and envy here and there, and before you know it your friendship fades. The more favors and gifts you supply to revive the friendship, the less gratitude you receive.