"The most powerful weapon on earth is the human soul on fire"

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

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

"The best weapon against an enemy is another enemy"

"Non-violence is the greatest force at the disposal of mankind. It is mightier than the mightiest weapon of destruction devised by the ingenuity of man"

"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"

"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"

"Print is the sharpest and the strongest weapon of our party"

"Hungry man, reach for the book: it is a weapon"