Max Born, Experiment and Theory in Physics (1943)

But I am no expert in these cosmological questions, and I do not intend to stress some weak points of the theory. That would be unjust, for the audacity of the idea of deducing the structure of the world from a few principles, and the skill in overcoming formidable difficulties, can but be admired. I do not wish to discourage anybody who feels in himself the vocation to embark on so adventurous a journey.

But I believe that there is no philosophical highroad 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. We do not find signposts at crossroads, but our own scouts erect them, to help the rest.