The first of five prefaces of comprehension and realization that will bring one to completely trust in GD is belief and clear recognition that the 7 qualities that would bring one to trust is exclusive to GD. pg 373 Nefesh Hachaim The power of thought is controlled by the Neshamah, the heights of the three level of the soul, which resides in the brain. It gives one the ability to know and understand the Torah Hakdosha. Gate One, Chapter 14 pg 56