Quotes from Leon C. Megginson

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

It is not the strongest or the most intelligent who will survive but those who can best manage change.

It is not the most intellectual of the species that survives; it is not the strongest that survives; but the species that survives is the one that is able best to adapt and adjust to the changing environment in which it finds itself.