Effective leadership is not about making speeches or being liked; leadership is defined by results not attributes.
Management is doing things right; leadership is doing the right things.
The most important thing in communication is hearing what isn't said.
Efficiency is doing things right; effectiveness is doing the right things.
Most of what we call management consists of making it difficult for people to get their work done.
Business, that's easily defined - it's other people's money.
Knowledge has to be improved, challenged, and increased constantly, or it vanishes.