As to the soul of man after death, it remains in the degree of purity to which it has evolved during life in the physical body, and after it is freed from the body it remains plunged in the ocean of God's Mercy.
And now concerning thy question regarding the soul of man and its survival after death. Know thou of a truth that the soul, after its separation from the body, will continue to progress until it attaineth the presence of God, in a state and condition which neither the revolution of ages and centuries, nor the changes and chances of this world can alter. It will endure as long as the Kingdom of God, His sovereignty, His dominion and power will endure. It will manifest the signs of God and His attributes, and will reveal His loving kindness and bounty. The movement of My Pen is still when it attempteth to befittingly describe the loftiness and glory of so exalted a station.
The nature of the soul after death can never be described, nor is it meet and permissible to reveal its whole character to the eyes of men.
... the primary purpose in revealing the divine law—which is to bring about happiness in the after life and civilization and the refinement of character in this—will be realized. As for the sword, it will only produce a man who is outwardly a believer, and inwardly a traitor and apostate.
Night hath succeeded day, and day hath succeeded night, and the hours and moments of your lives have come and gone, and yet none of you hath, for one instant, consented to detach himself from that which perisheth. Bestir yourselves, that the brief moments that are still yours may not be dissipated and lost. Even as the swiftness of lightning your days shall pass, and your bodies shall be laid to rest beneath a canopy of dust. What can ye then achieve? How can ye atone for your past failure?