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- Men are weak now, and yet they transform the Earth’s surface. In millions of years their might will increase to the extent that they will change the surface of the Earth, its oceans, the atmosphere and themselves. They will control the climate and the solar system just as they control the Earth. They will travel beyond the limits of our planetary system; they will reach other Suns and use their fresh energy instead of the energy of their dying luminary. 
- Man must at all costs overcome the Earth's gravity and have, in reserve, the space at least of the Solar System.
- A lot of my discoveries have already been discovered before. I only see personal significance in these works, as they gave me self-confidence... At first, I've been making long-known discoveries, then not so long-known ones, and then completely new ones.