All the universe is full of the lives of perfect creatures.

The Earth is the cradle of humanity, but mankind cannot stay in the cradle forever.

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.

I do not remember how it got into my head to make the first calculations related to rocket. It seems to me the first seeds were planted by famous fantaseour, J. Verne.

Earth is the cradle of humanity, but one cannot remain in the cradle forever.

My entire life consisted of musings, calculations, practical works, and trials. Many questions remain unanswered; many works are incomplete or unpublished. The most important things still lie ahead.