We have sought for firm ground and found none.
The deeper we penetrate, the more restless becomes the universe;
all is rushing about and vibrating in a wild dance.
I believe there is no philosophical high-road in science,
with epistemological signposts.
No, we are in a jungle and find our way by trial and error,
building our road behind us as we proceed.
Intellect distinguishes between the possible and the impossible;
reason distinguishes between the sensible and the senseless.
Even the possible can be senseless.
Max Born