How to practise devotion? Krishna asks Arjuna to fix his entire mind on Him. As often as the mind wanders it should be brought back to the Lord.
If this process of concentration is difficult he should dedicate all his actions to Him, feeling that it is His power that activates everything.
If this is also beyond his ability, he should offer all his actions to the Lord, abandoning the desire for their fruits. He should take complete refuge in Him. The devotee who surrenders himself completely to the Lord attains perfect peace and tranquillity of mind.