1. To Know is to be in touch with nature, i.e., the way things are.
2. To embody the Good is to follow nature’s course.
3. To manifest Beauty is to follow along the way of things with grace.
4. Radiance brings all three into harmony in the soul. I.e., radiance is the way–the gentle demeanor, the graceful act, the eloquent voice–of manifesting all three at once.
Hence, radiance just is being in touch with, while going along with, nature in the way of lightness and grace.