In the natural world we can verify that the sun produces growth. The electrifying rays of the sun allow the plants to grow, and the trees to reach out to the heavens above. The solar energy transforms water by evaporating it into clouds, which then produces a new energy, a secondary force that we know as thunder and lightning. The water that pours down from the heavens hydrates and nourishes the plant and vegetable kingdom. The animal and human kingdom feed upon the vegetable kingdom which also promotes growth of the physical bodies.
A more subtle growth that occurs is the mental, and the intellectual growth. We see this mostly in the human kingdom. People are striving to become mentally more capable, learning trades and skills, language, and all aspirations to refine the intellect.
A certain degree of conscience looks at the sun and sees its physical effulgence only. The physical sun which grows plants and produces heat and light and creates the physical bodies, without it physical life would not exist. Using the the secret of analogies we can see the triune nature of the sun. The physical, the mental, and the spiritual. Behind the light and heat is love. The triune nature of the sun is also seen in the microcosm of man and his three fold nature of body, mind and spirit each one less dense than the other. A more subtle degree of conscience sees through the physical aspect of the Sun and recognizes the cognizance the sun bestows which allows us to be self aware and self reflect in the same way light is reflected into water. The sun and our inner water allows us to self reflect. This gives way to all sorts of different utilizations of the mental faculty. Thinking patterns, imagination, self observation,and such things that allow the inner being to utilize the mind to analyze its surrounding and circumstances and our ability to overcome the animal impulses of the material nature and rise above it.
Inner Mysteries 