Soul is inherent in organisms. Where there is life–Nature–there is Soul.
All creatures and humans (even brain-dead humans) have Soul.
Spirit “saves” the Soul, so to speak. That is, Soul (which “arises” in matter as life) and Spirit (which “descends” into life as intelligence) MEET within an organism to complete, as it were, the purpose of life:
The “Divine Marriage” of Soul and Spirit.
This can only happen within a human being, as a consequence of our highly developed brain’s receptivity to Spirit–through the faculty of intelligence, by means of INSPIRATION.
The “Soul” counterpart to intelligence is instinct–again, found throughout Nature–and its counterpart to INSPIRATION is INTUITION.
Just as INSPIRATION is the doorway to Spirit through intelligence, so INTUITION is the doorway to Soul through instinct.
In Christian terms, Christ became a man in order to save the souls of all people–paving the way for the personal indwelling and guidance of the Holy Spirit for all who believe and are willing to receive this free gift of (and from) God.