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“Brilliant men are often strikingly ineffectual; they fail to realize that the brilliant insight is not by itself achievement. They never have learned that insights become effectiveness only through hard systematic work.”
― Peter F. Drucker, The Effective Executive: The Definitive Guide to Getting the Right Things Done

“You should not change yourself, but create yourself, that mean build around your strengths and removing bad habits”
― Peter F. Drucker, Managing Oneself

“Culture eats strategy for breakfast.”
― Peter F. Drucker

“Manners are the lubricating oil of an organization. It is a law of nature that two moving bodies in contact with each other create friction. This is as true for human beings as it is for inanimate objects. Manners- simple things like saying 'please' and 'thank you' and knowing a person’s name or asking after her family enable two people to work together whether they like each other or not. Bright people, especially bright young people, often do not understand this. If analysis shows that someone’s brilliant work fails again and again as soon as cooperation from others is required, it probably indicates a lack of courtesy â€� that is, a lack of manners.”
― Peter Drucker