Who said "The real enemy isn't out there. It's within."?

This quote is attributed to General Groves.

The real enemy isn't out there. It's within. - General Groves

"The real enemy isn't out there. It's within."

General Groves Fear

"The object of war is not to die for your country, it's to make the other fellow die for his."

"We have the best scientists in the world. Now we need the best management."

"Success is not measured in what we build, but in what we prevent."

"Time is the most precious commodity we have. Waste it and you waste everything."

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."