If we want to avert an impending calamity and a state of things which may transform this globe into an inferno, we should push the development of flying machines and wireless transmission of energy without an instant’s delay and with all the power and resources of the nation.

Years hence it will be possible for nations to fight without armies, ships or guns, by weapons far more terrible, to the destructive action and range of which there is virtually no limit. A city, at any distance whatsoever from the enemy, can be destroyed by him and no power on earth can stop him from doing so.

I am filled with conviction that the interests of humanity would be best served if the United States remained true to its traditions and kept out of “entangling alliances.

Our bodies are of such complexity of structure, the motions we perform are so numerous and involved, and the external impressions on our sense organs to such a degree delicate and elusive that it is hard for the average person to grasp this fact.

We crave for new sensations but soon become indifferent to them. The wonders of yesterday are today common occurrences

Life is and will ever remain an equation incapable of solution, but it contains certain known factors.

Today's scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality.

I am credited with being one of the hardest workers and perhaps I am, if thought is the equivalent of labour, for I have devoted to it almost all of my waking hours. But if work is interpreted to be a definite performance in a specified time according to a rigid rule, then I may be the worst of idlers.

Be alone, that is the secret of invention; be alone, that is when ideas are born.