“Now even those of us with modest endowments, will have to learn to manage ourselves. We will have to learn to develop ourselves. We will have to place ourselves where we can make the greatest contribution. And we will have to stay mentally alert and engaged during a 50 year working life, which means knowing how and when to change the work we do.”[i]
[i] Drucker, Peter, “Managing Oneself,” Harvard Business Review, March-April, 1999, p. 65-66.