A battle…was fought in heaven. Michael and his angels fought with the dragon. … “Michael” means “who is like God.” By this name is meant the likeness to God which righteousness alone preserves. (Adam of Perseigne, d. 1221)

"The Garden Within, All Things Are Possible Here". the text that this painting refers to is "My beloved is as a garden within." (Canticle of Canticles)

Here is the definition of garden in Wilma Tanner's book (the best I know on symbols): A garden represents the fertile soil of your mind in which you plant and grow ideas and seed-thoughts. As Edgar Cayce says, "Thoughts are things" and "Mind is the builder." The ideas you hold in mind produce the events and situations in your life. A garden can be a symbol of your soul, your mind, your thoughts, your job, your ministry, or your flock (any group of people within your sphere of influence: friends, family, students, co-workers, etc.) A garden may also be the Garden of Prayer where you plant your hopes, dreams, and prayers for yourself and others. Just as a garden can produce both weeds and flowers unless diligently cared for, our minds also need continuous vigilance and cultivation and persistent weeding. (Wilda Tanner: "The Mystical, Magical, Marvelous World of Dreams." James Allen:" A man's mind is like a garden which may be intelligently cultivated or allowed to run wild. But whether cultivated or neglected, it must, and will, bring forth."