Konstantin Tsiolkovsky

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

A planet is the cradle of mind, but one cannot live in a cradle forever.

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

From the moment of using rocket devices; a great new era will begin in astronomy: the epoch of the more intensive study of the firmament

Man must at all costs overcome the Earth's gravity and have, in reserve, the space at least of the Solar System.