Mr. Vasudev says that ‘yogic systems always claimed’ that knowing the microcosm is knowing the macrocosm, and tries to portray these claims as being consistent with modern physics. The words ‘microcosm’ and ‘macrocosm’ are philosophical or literary terms that don’t have rigorous scientific definitions. This makes redundant and harmful, any attempt to link such an interpretation of what is vaguely mentioned in the vedic scriptures to science. Even if we assume that ‘microcosm’ and ‘macrocosm’ relate to the different scales over which phenomena occur, it is grossly wrong to claim that somehow, physical laws are invariant over scale. The most obvious counterexample to such a ‘microcosm-macrocosm’ equivalence is quantum phenomena which are drastically different from classical phenomena.
Initially Zaehner's reputation rested on his studies of Zoroastrianism , at first articles mostly on philology in academic journals. He labored for many years on a scholarly work, his Zurvan , a Zoroastrian dilemma (1955). This book provides an original discussions of an influential theological deviation from the Zoroastrian orthodoxy of ancient Persia's Achaemenid Empire , which was a stark, ethical dualism . Zurvanism was promoted by the Sasanian Empire (224-651) which arose later during Roman times. Until the Muslim conquest, Zurvanism in the Persian world became established and disestablished by turns.