Flu germs are the only beings unfamiliar with worries about housing. "Entry Into Orbit"

If man had more of a sense of humor, things might have turned out differently. "Solaris"

Just because I drift about from one end of space to another and poke my nose into the cosmos, does that mean I'm not allowed to get drunk? "Solaris"

Certain events, which have actually happened, are horrible, but what is more horrible still is what hasn't happened, what has never existed. "Solaris"

I was not mad. The last ray of hope was extinguished. "Solaris"

Man has gone out to explore other worlds and other civilizations without having explored his own labyrinth of dark passages and secret chambers, and without finding what lies behind doorways that he himself has sealed. "Solaris"

Science is concerned with phenomena rather than causes. "Solaris"