Samatha and vipassanā cannot developed without knowledge of the practice, because both samatha and vipassanā are degrees of paññā. If one wants to have a higher degree of tranquillity one develops samatha. Samatha is a mean of being removed from sense impressions and thus one is at those moments not enslaved to them. The aim of samatha is to develop samādhi or concentration, by means of which defilements are temporarily eliminated, not eradicated. Only paññā developed in vipassanā can eradicate defilements.