Bhagavad Gita Verse 62, Chapter 18

tameva sharanam gaccha sarvabhaavena bhaarata |
tatprasaadaatparamaam shaantim sthaanam praapsyasi shaashvatam || 62 ||
 
Take refuge wholeheartedly in him only, O Bhaarata. With his grace you will attain supreme peace and the eternal abode.
 
tam : him
eva : only
sharanam : refuge
gaccha : take
sarvabhaavena : wholeheartedly
bhaarata : O Bhaarata
tatprasaadaat : with his grace
paramaam : supreme
shaantim : peace
sthaanam : abode
praapsyasi : you will attain
shaashvatam : eternal
 
Imagine that a mother is cooking in the kitchen. Her twins are playing in the hall. It is time for their next meal. One twin has learned how to walk before the other twin, and so, walks across the hall to drink his glass of milk. Frustrated at his efforts to walk, the second twin cries out to his mother. The mother immediately rushes to lift him up and give him his glass of milk. She knows that the first child does not need her help, but the second one does.
 
Shri Krishna says that for people who are still in stuck in the material world, who cannot renounce it in order to gain knowledge about the eternal essence, do have a shot at liberation. This can only happen by taking refuge in Ishvara. But this is no ordinary kind of refuge. It is sarve bhavena, it is wholehearted surrender, also known as sharanaagati. We cannot partially take refuge in Ishvara and also take refuge in material entities such as wealth, power and influence. We cannot hedge our bets in this manner. It has to be complete surrender to Ishvara.
 
So what is the result of sharanaagati? It is the grace, the prasaada, of Ishvara. It is like the mother automatically lifting the child, without any effort of the child. This grace removes all impurities from the mind, resulting in supreme peace, parama shaanti. We stop worrying about our food, clothing and shelter, since we realize it was always in the hands of Ishvara. We simply carry on performing our duty. In time, through the grace of Ishvara, the seeker attains the eternal abode, the shaashvata sthaanam of Ishvara, which is liberation from all sorrow.

Bhagavad Gita Verse 37, Chapter 2

hato vaa praapsyasi svargam jitvaa vaa bhokshyase maheem |
tasmaaduttishta kaunteya yuddhaaya kritanishchayaha || 37 ||
 
If you are killed, you will obtain heaven; and if you win, you will enjoy this earth. Therefore, O Kaunteya, arise and decide to engage in war.
 
hataha : you are killed
vaa : if
praapsyasi : obtain
svargam : heaven
jitvaa : you win
vaa : if
bhokshyase : enjoy
maheem : earth
tasmaat : therefore
uttishta : arise
kaunteya : O Kaunteya
yuddhaaya : in war
kritanishchayaha : decide to engage
 
Here Shri Krishna makes yet another plea to Arjuna not to shirk away from duty. This time, however, the message is more specific - Shri Krishna does not want Arjuna to resort to inaction or stasis.
 
Here Shri Krishna is saying : "Arjuna, regardless of whether you win or lose, the outcome will always be favourable. But the longer you keep pondering over your fight or not-to-fight dilemma, the further you move away from action towards inaction. Under no circumstances is inaction permissible. Therefore, fight!"
 
When faced with tough situations, our natural instinct is to move away from action towards inaction. There is always a hesitation, sometimes procrastination. And usually, this hesitation is caused by a fear of failure, or fear of trying something that we have not done before.
 
But Shri Krishna advises us that as long as we are performing actions that are aligned to our svadharma, our duty, action is always preferable to inaction or procrastination. The outcome of performing an action in accordance with our duty will always be favourable.
 
Footnotes
1. In common usage, Dharma means religion, so sva-dharma could mean "one's religion". And so, this verse has the potential to be translated as "everyone should fight a war for one's religion". This is a misinterpretation. If one really is a warrior (in the army, navy etc.) then they should definitely fight for their country. But if one is not a warrior by profession, there is no need to fight.