आहर निद्रा भय मैथुनं च सामान्यमेतत पशुभिर्नराणाम् धर्मो हि तेषाम् अधिको विशेषो धर्मेण हीना पशुभिः समाना ahara-nidra-bhaya-maithunam ca samanyam etat pashubhih naranam dharmo hi tesham adhiko vishesho dharmena hina pashubhih samanah Hunger, sleep,fear and sexual desire are the instincts which are common between mankind and beasts (animals). .It is especially 'Dharma;' that mankind possesses additionally, and a person bereft of 'Dharma' is like a beast, “Eating, sleeping, fearing, and mating are the four principles of animal life. These are common both to animals and to human beings. But religion is the extra function of the human being. Without religion, human life is no better than animal life.” -from Mahabharata