For one who has conquered the self by the self, the self is a friend; but for one who has not mastered the self, the self remains hostile, like an enemy.
बन्धुरात्मात्मनस्तस्य येनात्मैवात्मना जितः | अनात्मनस्तु शत्रुत्वे वर्तेतात्मैव शत्रुवत् ||६-६||