You have asked me about the Mobile and the Immobile. Hear my answer That which is mobile is Nature, which, undergoing changes, forms the cause of Creation and Destruction, The Immobile is Soul, for without himself undergoing changes he assists at Creation and Destruction.
चलां तु प्रकृति प्राहुः कारणं क्षयसर्गयोः। आक्षेपसर्गयोः कर्ता निश्चलः पुरुषः स्मृतः॥