Alternate currents, especially of high frequencies, pass with astonishing freedom through even slightly rarefied gases. The upper strata of the air are rarefied. To reach a number of miles out into space requires the overcoming of difficulties of a merely mechanical nature.

All that was great in the past was ridiculed, condemned, combated, suppressed — only to emerge all the more powerfully, all the more triumphantly from the struggle.

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

Every living being is an engine geared to the wheel-work of the universe.

Our virtues and our failings are inseparable, like force and matter. When they separate, man is no more.

When natural inclination develops into a passionate desire, one advances towards his goal in seven-league boots.

If you only knew the magnificence of the 3, 6 and 9, then you would have the key to the universe.