The process of becoming identified with the Higher Self is brought about by the Holy Guardian Angel, who works on us through the subconscious mind, where our Animal Soul resides. He/She/It finds all the leftover scars from former incarnations and the earlier parts of this one, known as samskaras in Eastern philosophical terms. They are brought to conscious awareness as events, people, dreams, feelings, thoughts that require balancing. These are not all dumped into our consciousness at the same time, thank goodness! They are gradually and thoroughly dealt with. At the conscious level, we observe patterns in our thinking, feeling, and behavior that are unbalanced in some way, whether that be frequent irritation or frustration, or other fiery parts (the Lion), or emotional states and weaknesses (the Eagle). The Angel gives us the needed balance to the remaining "holes in our souls". A major part of this process is that these unconscious patterns become conscious. Then we can seek to develop the opposite qualities.
Finally, the end result is Cosmic Consciousness. Once again, I cannot lay claim to having attained this level of Spiritual Unfoldment. I only know what I have been told, which is that once this is attained, the human being lives life as a joyous, free expression of the Higher Self. Key 21, The World, is attributed to Saturn, which brings us full circle. We began with Key 15, Capricorn, ruled by Saturn, and symbolizing bondage, which is what we need to prompt us to work on ourselves and our lives. Now we have Saturn itself, which involves restricting the field of activity. True freedom always involves that kind of discipline. To be a good dancer, a person must dedicate themselves to constant practice and effort. In the end, the dancer can leap as if with winged feet, to embody freedom of movement. But an undisciplined or half-hearted attempt at learning dance will not bring that about. Therefore, spiritual unfoldment requires constant focus and what seems like effort. In the end, we know that all the effort was made by the Lord of the Universe, and we have simply responded to that Mind.