It is not the strongest of the species that survives, nor the most intelligent, but rather the one most adaptable to change.

As quoted in Improving the Quality of Life for the Black Elderly: Challenges and Opportunities : Hearing before the Select Committee on Aging, House of Representatives, One Hundredth Congress, first session, September 25, 1987 (1988)

This quote's earliest known source is from Leon C. Megginson (see Charles Darwin)