The correct answer is will.
According to Scholasticism, truth is God's will. Scholasticism is a way of thinking that originated in 1100s and lasted until 1700s, as a result of trying to combine philosophy with religion, theology. Here, its main figures (such as Thomas Aquinas, Bonaventure, Albertus Magnus, and others) are trying to determine what the actual truth about the world is - and according to them, whatever God wills is the truth.