CCC 367

Sometimes the soul is distinguished from the spirit: St. Paul for instance prays that God may sanctify his people "wholly", with "spirit and soul and body" kept sound and blameless at the Lord's coming. 1 Th 5:23. The Church teaches that this distinction does not introduce a duality into the soul. Cf. Council of Constantinople IV (870): DS — Denzinger–Schönmetzer (Enchiridion Symbolorum). "Spirit" signifies that from creation man is ordered to a supernatural end and that his soul can gratuitously be raised beyond all it deserves to communion with God. Cf. Vatican Council I, Dei Filius: DS — Denzinger–Schönmetzer (Enchiridion Symbolorum); GS 22 # 5; Humani generis: DS — Denzinger–Schönmetzer (Enchiridion Symbolorum).

Read the full chapter 1. I Believe in God the Father ¶198–421