In the final chapter, Lord Krishna presents Arjuna with His most supreme teaching:
Abandon all duties and take refuge in Me alone.
I will liberate you from all sins: fear not. (18:66)
This is a very powerful mantra which will help the devotee to effect total self-surrender if he constantly keeps before his mind the feeling: “I surrender myself to God.” Those who repeat this with feeling will soon receive the grace of the Lord and be able to accomplish perfect self-surrender.
The grace of the Lord cannot come to one who thinks and speaks of his own ability. God’s grace descends on the very humble soul who upholds that God does everything and knows that he is only an instrument in His hands.