What goes on mounting continually?

Each soul is capable of the highest degree of development as an advanced spirit―or angel. 

Angels are souls who have passed from the lowest degree of human planetary life through all the planetary spheres until they have attained to the celestial spheres of the solar system―the Heaven of Heavens. 

The soul goes on mounting continually and journeying through that vast and limitless creation, which has no end and has had no beginning. 

How can we hope to form any clear idea of the nature and attributes of that Supreme Being―the Omnipotent Ruler of the Universe―seeing we cannot even fully and clearly grasp the magnitude of his creation?