Purport

In the last two Shlokas, Bhagvan Shri Krishna explained the importance of the status of mind in the last moments. In whatever mental status one leaves this body achieves the same in the next life. If he thinks of Bhagvan Shri Krishna alone at that moment he achieves the abode of Shri Krishna.

Since Arjuna was fighting a war where death might come any time. Shri Krishna hence instructed Arjun to dedicated himself to Shri Krishna so that he will achieve the supreme abode of Shri Krishna in all situations.

Though this instruction is given to Arjun, this applies to all. Death in most of cases does not come by giving advance notice. Therefore a human should always remember Shri Krishna. Those who keep Shri Krishna in their thought all the time have their liberation guaranteed.