“The world is desperately imperfect. Even if a quarter of the working people were engrossed in new thoughts and inventions and lived off the others, humanity would still gain tremendously thanks to ...”

“Earth is the cradle of humanity, 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.”

“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.”

“Mankind will not forever remain on Earth but, in the pursuit of light and space, will first timidly emerge from the bounds of the atmosphere and then advance until he has conquered the whole of cir...”

“When man will return to nature, nature will return to him.”

“The sky is an enormous man.”

“When the full-grown poet came,Out spake pleased Nature (the round impassive globe, with all its shows of day and night,) saying, He is mine;But out spake too the Soul of man, proud, jealous and unr...”

“Heaven is under our feet as well as over our heads.”

“Wherever forests have not been mowed down, wherever the animal is recessed in their quiet protection, wherever the earth is not bereft of four-footed life - that to the white man is an 'unbroken wi...”

“Earth is the holiest place in the Universe, loving the earth, and loving life is the way to generate positive vibrations.”

“It's time for the human race to enter the solar system.”