"I grew up in Texas, but that was 20 years ago. Last year, in Fort Worth, they had hail the size of softballs. We're seeing more and more powerful storms, of all types, almost on a biblical level"

"It is only when they go wrong that machines remind you how powerful they are"

"Powerful indeed is the empire of habit"

"The most valuable possession you can own is an open heart. The most powerful weapon you can be is an instrument of peace"

"Education is the most powerful weapon which you can use to change the world"

"Situational variables can exert powerful influences over human behavior, more so that we recognize or acknowledge"

"Welcome those big, sticky, complicated problems. In them are your most powerful opportunities"

"Developments in information technology and globalised media mean that the most powerful military in the history of the world can lose a war, not on the battlefield of dust and blood, but on the battlefield of world opinion"

"We cannot continue to rely only on our military in order to achieve the national security objectives that we've set. We've got to have a civilian national security force that's just as powerful, just as strong, just as well-funded"

"He who controls others may be powerful, but he who has mastered himself is mightier still"

"The two most powerful warriors are patience and time"