“To believe in nothing is as ridiculous as to believe in everything. Reason and factual evidence may convert a belief into knowledge.”

“Why is it so difficult for us to think in relative terms? Well, for the good reason that human nature loves absoluteness, and erroneously considers it as a state of higher knowledge.”

“If Relativity Theory kills our deepest convictions, why not start by finding out why we believed in them for millennia?”

“Both space and time are metrically amorphous, i.e. they do not have - despite how strongly we believe so - an inherent metric which would allow us to measure them without any definitions. In this sense, thus, neither space nor time is absolute.”

“... One can know very much but comprehend very little and, besides, ... different objectives require different levels of knowledge - though always with the maximum possible comprehension suited to the purpose.”

“Teaching the layperson (divulgare) is not distorting (tergiversare) the subject, but educating the public; and it is our duty as scientists to educate without distorting the essence of the scientific knowledge attained by humanity. The future of our society depends upon this premise.”

“The universal character of the centrifugal forces leaves us impotent as to discern whether what is going on inside the carrousel is because we are rotating with respect to terra firma (remember my eyes are closed), or because – for some unknown reason unrelated to motion – radial gravitational field has temporarily emerged while the carrousel is as in repose as it was before the given impulse. The latter would have certainly been the interpretation adopted by an intelligent being, had s/he been born and grown up inside the carrousel, without any access whatsoever to the exterior world.”