“For people have within themselves struggles of confession and of denial… And in this struggle the question is: Is there a God or not? And the answer comes from the Holy Spirit Who dwells in the person:
God is, and created you, and also redeemed you.
But as long as this question and answer are in a person, the power of God will not be absent from him, for this question and answer carries with it penitence. But when this question is not in a person, neither is the answer of the Holy Spirit, for such a person drives out God’s gift from himself and without the question that leads to penitence, throws himself upon death. And the Virtues display to God the battles of these wars, for they are the seal that shows God the intention that worships or denies Him.”
Source: St. Hildegard of Bingen, Hildegard of Bingen: Scivias (Classics of Western Spirituality (Paperback)), Paulist Press, 1990.