Peter F. Drucker
True effectiveness is a discipline that can be learned rather than an innate talent. It requires shifting your focus from simply doing things right to actually doing the right things.
You must meticulously track and consolidate your time because it is your most limited and irreplaceable resource.
Focus your efforts on outward contributions and tangible results instead of getting lost in internal organizational bureaucracy.
Staff your team and evaluate performance based on what people can do exceptionally well rather than trying to minimize their weaknesses.