On account of the obligation of birth, one is compelled to live within the womb,—for the union of vital seed and blood. Living there is defiled with excreta urine and phlegm, and always fouled with blood that is created there.
जन्मतो गर्भवासं तु शुक्रशोणितसम्भवम्। पुरीषमूत्रविक्लेदं शोणितप्रभवाविलम्॥