Man has two bodies, one composed of Light - Tzelem Elohim, or Image of God - and the other composed of physical matter. The Light body is our protective shield that shines and projects outward from our physical selves. The Zohar explains that even deadly animals fear us when this force radiates at maximum power. Negative actions gradually weaken and dim this protective Light. This arouses fears within us, which in turn make us vulnerable to destructive external forces.
This secret is concealed in the Torah story of God blessing Noah and his children so that all the animals shall fear them. Knowing this secret rekindles the Light aspect of our body.