Nahmanides, often critical of the rationalist views of Maimonides, pointed out (in his commentary to Genesis) several non-sequiturs stemming from a literal translation of the Bible's account of Creation, and stated that the account actually symbolically refers to spiritual concepts. He quoted the Mishnah in Tractate Chagigah which states that the actual meaning of the Creation account, mystical in nature, was traditionally transmitted from teachers to advanced scholars in a private setting. Many Kabbalistic sources mention "Shmitot" - cosmic cycles of creation, similar to the Indian concept of yugas.