CCC 155

In faith, the human intellect and will co-operate with divine grace: "Believing is an act of the intellect assenting to the divine truth by command of the will moved by God through grace."²⁷ St. Thomas Aquinas, STh II-II, 2, 9; cf Dei Filius 3; DS 3010DS — Denzinger–Schönmetzer (Enchiridion Symbolorum).