We do not know: we can only guess.

Philosophers
Karl Popper
Austrian-British philosopher (1902-1994), a leading philosopher of science. He proposed falsifiability as the criterion of scientific status; The Open Society (1945) defended liberal democracy. Soros named him mentor.
View this figure's profile
Karl Popper's Other Quotes
Related Quotes
You must learn all things: both the steadfast heart of well-rounded Truth and the opinions of mortals, in which there is no true trust.
-- Parmenides
For thinking and Being are the same.
-- Parmenides
Those who understand that things arise dependently know them to be empty.
-- Nagarjuna
The trouble with people is that they love playing teacher to others.
-- Mencius
Stay Hungry. Stay Foolish.
-- Steve Jobs
Before you point your fingers, make sure your hands are clean.
-- Li Ka-shing