“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.”

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

“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.”

“The universe is seeming really huge right now. I need something to hold on to.”

“The Universe is under no obligation to make sense to you.”

“Sometimes I try to erase myself. And then, if I've done a good job, I'm erased. I'm nothing. And then the world is free to flow into me like water into an empty bowl. And I see. I hear. But not wit...”

“There is truth, my boy. But the doctrine you desire, absolute, perfect dogma that alone provides wisdom, does not exist. Nor should you long for a perfect doctrine, my friend. Rather, you should lo...”

“Don't aim for perfection. Aim for 'better than yesterday'.”

“What was happening to them was that every bad time produced a bad feeling that in turn produced several more bad times and several more bad feelings, so that their life together became crowded with...”

“And the turtles, of course...all the turtles are free, as turtles and, maybe, all creatures should be.”

“The more we respect other creatures, the more respect our humanity will get!”

“She said that that was the disadvantage of bringing creatures into the house: one grew used to them, and then, one had the upset of their loss.”