"I have not invented a 'death ray'. I don't need a 'death ray' to destroy an army. I can simply create a vibratory force that would shatter the earth."

"Insufficient observation is only a form of unknowing, a cause of many perverse incidents and a triumph of crazy ideas."

"The spread of civilization may be likened to a fire; first, a feeble spark, next a flickering flame, then a mighty blaze, ever increasing in speed and power."

"I am equally proud of my Serbian origin and my Croatian homeland."

"I could only with difficulty understand the enthusiasm of others for any but engineering achievements."