Here are a couple of pithy ones from Aristotle’s teacher, the star pupil of Socrates and the originator of the Atlantis myth as written in his dialogues Timaeus and Critias.
The first quote I find especially relevant to those who reject the metaphorical light of science and knowledge, those who fear facts and wish to discredit the fact-finders and remain in the darkness of ignorance, and who often try to get others to fear as do they, by duress or by trickery.
The second concerns the reason that we skeptics have such a problem with letting charlatanry and false claims go without exposure and criticism, though I take the use of the word ‘soul’ to mean a person, rather than a metaphysical spiritual essence that survives death the way many religionists often use the term. Uncritical acceptance of false claims has serious consequences to those who hold them as revealed, unchanging Fact.
We can easily forgive a child who is afraid of the dark; the real tragedy of life is when men are afraid of the light.
False words are not only evil in themselves, but they infect the soul with evil.