I think we Americans tend to put too high a price on unanimity, as if there were something dangerous and illegitimate about honest differences of opinion honestly expressed by honest men.
We must care to think about the unthinkable things, because when things become unthinkable, thinking stops and action becomes mindless.
We must dare to think 'unthinkable' thoughts. We must learn to explore all the options and possibilities that confront us in a complex and rapidly changing world.
I do not think it is "selling America short" when we ask a great deal of her; on the contrary, it is those who ask nothing, those who see no fault, who are really selling America short!
We must dare to think unthinkable thoughts.