 Like Aquinas, Maritain held that there was no conflict between true faith and true reason, that religious belief was open to rational discussion, and that the existence of God and certain fundamental religious beliefs could be philosophically demonstrated. (Maritain held, however, that ‘Russellian mathematical logic’ was “inferior to traditional Aristotelian logic”, and that any demonstration of religious belief needed to follow Aristotelian syllogistic; Introduction to Logic, 1923 [1937a: 222–232]; Kraal 2013: 357.) Religious belief, then, was not an attitude or a matter of private opinion—an option that could be embraced or not according to one’s private preferences; it was a matter of ‘truth’. For Maritain, one must choose between “the true God or radical irrationality” (Introduction to Philosophy, 1920 [1944: 259]). 