We cannot solve the problem of terrorism by asserting our will on the world.

In short, we cannot grow, we cannot achieve authentic discovery, and our eyes cannot be cleansed to the truly beautiful possibilities of life, if we simply live a neutral existence.

We cannot solve our problems with the same thinking we used when we created them.

We cannot solve life's problems except by solving them.

We cannot gamble with American lives. I will not gamble with American lives.

We cannot kill or capture our way out of an industrial-strength insurgency.