It is on account of the Soul being invested by Nature that these pairs of opposites, productive of happiness and woe, again and again come. It is on account of this Ignorance that individual Soul considers these sorrows to be his and imagines them as following him.
एवं द्वन्द्वान्यथैतानि समावर्तन्ति नित्यशः। ममैवैतानि जायन्ते धावन्ते तानि मामिति॥