If one is convinced that I am 'part and parcel of Krsna' one is not disturbed even in the midst of the greatest difficulties, because one knows that Krsna will give protection. That is surrender. To attain this position one must try his best, use his intelligence and believe in Krsna.
As stated by Prahlada Maharaja (SB 7.9.19) : My Lord Nrsimhadeva, because of a bodily conception of life, embodied souls neglected and not cared for You and therefore they cannot do anything for their betterment. Whatever remedies they accept, although perhaps temporarily beneficial, are certainly impermanent. For example, a father and mother cannot protect their child, a physician and medicine cannot relieve a suffering patient, and a boat on the ocean cannot protect a drowning man.
Whatever remedies they accept, although perhaps temporarily beneficial, are certainly impermanent. For example, a father and mother cannot protect their child from accidental deaths or calamities or any misery, a physician and medicine cannot relieve a suffering patient, and a boat on the ocean cannot protect a drowning man. If Krsna does not protect us, nothing can save us.
There may be many expert physicians treating a diseased man but there is no guarantee that he will live. On the other hand, if Krsna is protecting us, we will survive even without medicinal treatment. When one is fully surrendered to Krsna, he becomes happy knowing that Krsna will protect me. He is just like a child who is happy and confident under his parents protection. If we know that there is someone very powerful who is our patron and saviour, aren't we happy?
Of course Krsna is giving all living entities the protection, even in their rebellious condition (eko bahunam yo vidadhati kaman), but when we admit and recognize Krsna's kindness, we become happy. Krsna is protecting us at every moment, but we do not realize it because we have taken life at our own risk. Krsna gives us a certain amount of freedom saying "All right, do whatever you like." But when the living entity puts himself fully under the control of Krsna, he receives more protection and care.
Krsna says in Bhagavad Gita, 9.29 ; 'I envy no one, nor am I partial to anyone. I am equal to all. But whoever renders service unto Me in devotion is a friend, is in Me, and I am also a friend to him.'
How can Krsna be envious of anyone? Everyone is Krsna's son. Similarly, how can Krsna be an enemy toward anyone? He is everyone's friend. Unfortunately, we are not taking advantage of His friendship and that is our disease. Once we recognize Krsna as our eternal friend, we can understand that He is always protecting us, and in this way we can be happy.
Jaya Srila Prabhupada!