Companies that enjoy enduring success have core values and a core purpose that remain fixed while their business strategies and practices endlessly adapt to a changing world. The dynamic of preserving the core while stimulating progress is the reason that companies such as Hewlett-Packard, 3M, Johnson & Johnson, Procter & Gamble, Merck, Sony, Motorola, and Nordstrom became elite institutions able to renew themselves and achieve superior long-term performance.

p. 65 - "Building your company's vision," 1996