“Giese was an unemotional man, but then in the study of Solaris emotion is a hindrance to the explorer. Imagination and premature theorizing are positive disadvantages in approaching a planet where—as has become clear—anything is possible... The fact is that in spite of his cautious nature the scrupulous Giese more than once jumped to premature conclusions. Even when on their guard, human beings inevitably theorize.”

“Paranoid theorizing was too easy, too emotionally satisfying.”

“No worse fate can befall a young man or woman than becoming prematurely entrenched in prudence and negation.”

“It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts.”

“Wandering across the vast room, I stopped at a set of shelves as high as the ceiling, and holding about six hundred volumes - all classics on the history of Soalris, starting with the nine volumes of Giese's monumental and already relatively obsolescent monograph. Display for its own sake was improbable in these surroundings. The collection was a respective tribute to the memory of the pioneers. I took down the massive volumes of Giese and sat leafing through them. Rheya had also located som reading matter. Looking over her shoulder, I saw that she had picked one of the many books brought out by the first expedition, the Interplanetary Cookery Book, which could have been the personal property of Giese himself. She was pouring over the recipes adapted to the arduous conditions of interstellar flight. I said nothing, and returned to the book resting on my knees. Solaris - Ten Years of Exploration had appeared as volumes 4-12 of the Solariana collection whose most recent additions were numbered in the thousands.”

“To surrender to ignorance and call it God has always been premature, and it remains premature today.”