आहारनिद्राभयमैथुनानि समानि चैतानि नृणां पशूनाम् । ज्ञानं नराणामधिको विशेषो ज्ञानेन हीनाः पशुभिः समानाः ॥

Men have eating, sleeping, fearing and mating in common with the lower animals. That in which men excel the beasts is discretionary knowledge; hence, indiscreet men who are without knowledge should be regarded as beasts.