17.4-6  Yajante etc., upto asura-niscayan.  Unintelligently :  i.e. due to their lack of discrimination.  Emaciating Me too :  Because they do not follow the purport of the scriptures. That is why they undertake practising austerities invented by their own intellect and they are rather men of the Tamas (Strand). 		
 Like faith, the food also is of three types, differentiated by the Sattva etc.,  so are the sacrifice,  austerity and charity.  That is being detailed as :