The soul is subject to health and disease, just as is the body. The health and disease of both . . . undoubtedly depend upon beliefs and customs, which are peculiar to mankind.
MaimonidesTruth does not become more true by virtue of the fact that the entire world agrees with it, nor less so even if the whole world disagrees with it.
MaimonidesAn ignorant man believes that the whole universe only exists for him: as if nothing else required any consideration. If, therefore, anything happens to him contrary to his expectation, he at once concludes that the whole universe is evil. If, however, he would take into consideration the whole universe, form an idea of it, and comprehend what a small portion he is of the Universe, he will find the truth. There are many ... passages in the books of the prophets expressing the same idea.
Maimonides