There are only opinions, some of which are preferable to others. One can die for an opinion which is only preferable. Italian semiologist and writer. Index on Censorship , Vol. Ethical axioms are found and tested not very differently from the axioms of science.
Truth is what stands the test of experience.
German-born US physicist. And where speech is not, there is neither Truth nor Falsehood. Leviathan , Pt. I never can feel certain of any truth but from a clear perception of its beauty. Ye know on earth, and all ye need to know.