For the most part, people possess all three kinds of desires to different extents. But the admixture of those different needs differs from person to person. This explains the differences between individuals. People differ from one another physically in ways that are parallel to the way they differ from one another spiritually.
The spiritual souls of people have only a desire to grant satisfaction to their Creator, and this comes from the power of the reflected light that they receive from the upper worlds from which they [the souls] come. This desire [to grant satisfaction to the Creator] is the very essence of the soul. It follows that when the soul becomes enclothed in the body, it [the soul] births within the person the needs, thoughts, and education needed to fully grant that satisfaction to its Creator proportional to its [the soul’s] desire.