What are soul conditions?

This planet earth being the proper sphere to vegetate the material body, having conditions applicable to the soul and spirit of which I have spoken, it is necessary then to pay strict attention to the growth of the soul, so that the spirit, entering upon its new life may have a perfect body. With a perfect body and general experiences, combined with concentrated knowledge, which the mind has acquired through material experiences, the spirit grows in power and accomplishes noble works in the spirit spheres.

—B. H. In Spirit