The other state of insight, which is based on persistent practice, arises when all perception has been extinguished and only non-manifest impressions remain. ||18||

virama = cessation

pratyaya = perception, thought, intention, representation

abhyasa = practice, action, method

purvah = earlier

samskara = latent impressions

sheshah = store, residuum

anyaha = other

After one practices to still the thoughts, these four kinds of cognition fall away(mentioned in previous sutra 1.17), leaving only a store of latent impressions (samskara) in the depth memory.