"Philosophy is the true mother of science...." - Quote by Marcus Tullius Cicero

“It is a great proof of talents to be able to recall the mind from the senses, and to separate thought from habit.”

“Through doubt we arrive at the truth.”

“There is not a moment without some duty.”

“...there are some who are naturally fitted for philosophy and political leadership, while the rest should follow their lead and let philosophy alone.”

“Whereas the Greeks gave to will the boundaries of reason, we have come to put the will's impulse in the very center of reason, which has, as a result, become deadly.”

“As far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain, they do not refer to reality.”

“Scientists and engineers ought to stand side by side with athletes and entertainers as role models.”

“The Anti-Vivisector does not deny that physiologists must make experiments and even take chances with new methods. He says that they must not seek knowledge by criminal methods, just as they must not make money by criminal methods. He does not object to Galileo dropping cannon balls from the top of the leaning tower of Pisa; but he would object to shoving off two dogs or American tourists.”

“The variety of colour in objects cannot be discerned at a great distance, excepting in those parts which are directly lighted up by the solar rays.”