Srutis are like the pole-stars for illumination of the aspirant. What to speak of mundane forces, when even the celestial forces crave to disturb the aspirant's samadhi state of sweet quiescence! But, one can overcome these obstacles by firmly adhering to the Guru's instruction in the form of mantra, sacred syllable or such practices, which fetch him the grace of Bhagavati, the divine mother. This attainment of unitary state better be prior to death in this life or else it takes another life for its experience. *Source:* Shri Ribhu Gita (2.70), translated by Dr Lingeswara Rao and Dr Anil Sharma