If instructed, dhārnā-pārnā and other austerities are done for two months, but the subtle austerity1 simply cannot be achieved (i.e. difficult to put into practice). Footnotes: 1. 1. Subtle austerity is decreasing one’s intake by one morsel or eating less than one’s requirement. This type of austerity is more difficult than observing dhārnā-pārnā for example, in which one observes a complete fast every other day.