Jeffrey Sachs

We should define the world by its opportunities rather than by its dangers.

Our problems are manmade — therefore, they can be solved by man. And man can be as big as he wants. No problem of human destiny is beyond human beings.

Life is harsh and sometimes even ruthless. Only the tough survive. That is one strand of thinking. The other says: humankind is a species of designers, problem solvers, and seekers. We don't have to accept our follies and our missteps.