The soul is that which gives life to a body. The human soul is immortal and, united with the human body, is made in God's image and likeness. It is the innermost part of a person.
Intellect
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The intellect is a person's ability to know and understand. It is one of the powers of the human soul.
Will
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The will is a person's ability to freely choose and act. It is one of the powers of the human soul.