Only One Nature

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The spiritual soul is the “form” of the body. Man is not the union of two natures. In man, spirit and matter form one nature. God creates every spiritual soul immediately. It is not “produced” by the parents and does not perish at death. It is reunited with the body at the final resurrection.

When Paul writes about “spirit, soul, and body” (1Thess 5:23) he used the word “spirit” to mean that the soul has a supernatural goal of union with God. The biblical word “heart” also means the place where the person decides for or against God.

Ref. CCC

Taken From The Compendium – Catechism Of The Catholic Church