Never let people who want power/think they deserve it actually HAVE power.

From the FT

Can we have too much self-esteem?
At worst, high self-esteem can turn into narcissism. Jean Twenge, one of the main researchers in the field, goes as far as talking of an epidemic of narcissism, in which people who hold themselves in excessively high regard are more likely to lack empathy and experience relationship problems.
And high self-esteem can be displayed by people who do seriously objectionable things. As Steven Pinker puts it: “Self-esteem can be measured, and surveys show that it is the psychopaths, street thoughts, bullies, abusive husbands, serial rapists, and hate-crime perpetrators who are off the scale.”
Antonia Macaro Financial Times Magazine Jan 26/7 2013