You grieve for those who are not worthy of grief, and yet speak the words of wisdom. The wise grieve neither for the living nor for the dead.
Death is as sure for that which is born, as birth is for that which is dead. Therefore grieve not for what is inevitable.
For certain is death for the born and certain is birth for the dead; Therefore over the inevitable thou should not grieve
If you think that this (body) takes birth and dies perpetually, even then, O Arjuna, you should not grieve like this.
The embodied one within the body of everyone, O Bharata, is ever undestroyable. Therefore you should not grieve for any being.