How do you proceed from darkness into light?

Darkness in the spirit world is the condition, which surrounds the spiritually ignorant and undeveloped soul, the spiritually ignorant and undeveloped soul passes into spirit in that condition. 

Spheres of advancement are before you―

As you advance along the harmonial lines of Nature and spiritual growth you progress and evolve. It would be unnatural and impossible for a depraved and licentious man or addict to any vice to be translated to the bright light immediately at death.

All life, in or out of the body, is progressive. 

It is only by natural evolution that you proceed from darkness into light in your progress towards the Infinite.