This part of the Bhagavad Gita I like the most. Sri Krishna continues…
Just as a person gives up old worn-out garments and puts on new ones, the same way the Self gives up old and useless bodies and accepts new ones. (2.22)
This (the Self) can never be cut into pieces by the weapons, nor burnt by fire, nor moistened by water, nor dried by the wind. (2.23)
This (the Self) cannot be broken, it cannot be burned, it cannot be dissolved, it cannot be dried, it is eternal, all pervading, immovable, unchangeable and eternally the same. (2.24)
This (the Self) is impersonal, inconceivable, unchangeable. Thus knowing This to be such, you don’t deserve to lament. (2.25)
These three verses emphatically states that the Self is non-physical and removes all illusions and fears that may arise due to identifying oneself with the physical body.
Okay, but what if you are not able to accept all such concepts of about the Self? All we see is the physical body and, after all, Krishna himself says the soul is inconceivable. So why try to convince oneself with such unthinkable concepts? You may think so, that’s fine. Sri Krishna answers…
Even if you take this to have constant birth and death, you still don’t deserve to lament, O mighty armed! (2.26)
For, certain is death for the born and certain is birth for the dead; therefore, over the inevitable you should not grieve. (2.27)
All beings are unmanifested in their beginning, O Bharata, manifested in their middle state and unmanifested again in their end. What is there then to grieve about? (2.28)
A lump of clay on the surface of the earth takes the form of the pot, retains the form for a while, and then it’s broken and gets back to being the mass of clay on the surface of the earth. Similarly all beings are unmanifested in the beginning, manifest in the middle state and unmanifested again in the end. What’s there to grieve?
Some see This (the Self) with amazement, some speak about This with amazement. Yet others hear about This with amazement and there are others, who even after hearing about This don’t know (understand). (2.29)
Perhaps, this verse implies that only a few actually experience the real non-physical Self. Others speak about the Self, hear about it from others, and there are many others who even after hearing don’t understand at all. So, even if you can’t understand the Self, don’t worry, you still don’t have a reason to grieve as long as you can understand that death is certain for everything that’s born.
Grief is just unnecessary. Accept the inevitable and do what needs to be done. That is it.
This Self, the indweller in the body of everyone, is always indestructible, O Arjuna! Therefore, you need not grieve for any creature. (2.30)
Okay, this quote from Swami Vivekananda sums it up all, in meaning and spirit.
Stand up and fight! Not one step back, that is the idea. Fight it out, whatever comes. Let the stars move from the spheres! Let the whole world stand against us! Death means only a change of garment. What of it? Thus fight! You gain nothing by becoming cowards. Taking a step backward, you do not avoid any misfortune. You have cried to all the gods in the world. Has misery ceased? … The gods come to help you when you have succeeded. So what is the use? Die game. … You are infinite, deathless, birthless. Because you are infinite spirit, it does not befit you to be a slave. Arise! Awake! Stand up and fight!