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.