It is a simple feat of scientific electrical engineering — only expensive — blind, faint-hearted, doubting world.

To stop war by the perfection of engines of destruction alone, might consume centuries and centuries. Other means must be employed to hasten the end.

It is paradoxical, yet true, to say, that the more we know, the more ignorant we become in the absolute sense, for it is only through enlightenment that we become conscious of our limitations. Precisely one of the most gratifying results of intellectual evolution is the continuous opening up of new and greater prospects.

The beauty and the scent of roses can be used as a medicine and the sun rays as a food.

The desire that guides me in all I do is the desire to harness the forces of nature to the service of mankind.

Marconi is a good fellow. Let him continue. He is using seventeen of my patents.

So we find that the three possible solutions of the great problem of increasing human energy are answered by the three words: food, peace, work... Their scientific meaning and purpose now clear to me: food to increase the mass, peace to diminish the retarding force, and work to increase the force accelerating human movement.