Cultivate a deep understanding of yourself - not only what your strengths and weaknesses are but also how you learn, how you work with others, what your values are, and where you can make the greatest contribution. Because only when you operate from strengths can you achieve true excellence.
Classic Drucker: Essential Wisdom of Peter Drucker from the Pages of Harvard Business Review (ed. Harvard Business Press, 2006) - ISBN: 9781422101681