the explanation of the last verse of the Geeta

The famous verse uttered by the Supreme Lord SriKrishna at the end of his instructions to His beloved devotee and friend Arjuna was :sarva dharman parityagya
mam ekam saranam vraja,aham tvam sarva papebyah moksyasyami ma sucah.

1. Here the word darrma normally implies religion and righteous behavior but taken in the context of this instruction it means all types of obligatory duties which has to be necessarily performed by the person in the social arena for his well being and including material comforts.The point to note is this advice was given to Arjuna in a spiritual perspective for satisfaction and hapiness of the soul was deemed by the Lord as the highest goal of life.To explain further, Srila Saraswati Thakur has connoted the word dharma to mean upadhi or false designation(limited adjuncts).For example a man thinks he belongs to a certain race and he feels proud of it or a certain caste like of the highest order,or he may think of himself as an ascetic or feel himself very masculine or he may think himself as very learned or rich and vice versa .Unfortunately, all this are designations that the soul accrues in a certain life and relatively false from the standpoint of eternity.Therefore Lord Krishna tells him to give up these false designations artificially acquired by the mind and false ego and surrender to to Him alone who is the Supreme Lord ,assuring him that He will protect him from all sinful reactions.It is crucial here to understand and accept the Supreme Lord Krishna as the Supreme Divinity before the actual process of trying to surrender and that He cannot be compared to the other minor demigods that act under His jurisdiction.In this juncture it will be appropriate to mention that the constitutional position of the soul is as a servant of a God so surrender basically means to offer all the result's of our present works to God and to follow His laws in all aspects.Krishna assures Arjuna -.ma sucah -don't worry. Why is He saying that? -well because to give up all these designations is not pleasant and is a source of consternation for the soul.Therefore He mildly admonishes him to give up all that which is false with a reassurance that He will take care of him.This instruction is for all those souls wandering in this dismal abyss of the material world.