Spirit is Energy. Spiritual Growth is energetic growth. Energetic growth occurs with the appreciation of personal energy. My personal energy is the thought that I am thinking and the emotion that I am expressing.
In a three dimensional world, spiritual energy has three dimensions of body, mind & emotion. It is physical, mental & emotional. I think it, feel it & experience it. The mental thought of my mind with the emotional feelings of my heart are a physical experience of my body. At the emotional heart of my physical body is a mental mind, which conceives frequencies of thought with wavelengths of emotion as a vibrational experience.
Spiritual growth occurs when the quality of my energy is attained and attributable in a balanced, harmonious & beneficial way. The more balanced the polarity of my thoughts, the more harmonious the feeling of my emotions and the more beneficial to the growth of my Spiritual Soul.