Arjuna is the soul of Keshava and Krishna is the soul of the diadem-decked (Arjuna). In Arjuna victory ever resides and eternal glory is in Krishna.
अर्जुनः केशवस्यात्माकृष्णोऽप्यात्मा किरीटिनः। अर्जुने विजयो नित्यं कृष्णे कीर्तिश्च शाश्वती॥