"The knowledge derived through faith must not be considered less certain because its objects are not seen; for the divine light by which we know them, although it does not render them evident, yet suffers us not to doubt them. For God, who commanded the light to shine out of darkness, hath himself shone in our hearts (2 Cor. 4:6), that the gospel not be hidden to us, as to those that perish. (2 Cor. 4:3)."
-Catechism of the Council of Trent
Faith Excludes Doubt