Its commitment to Truth beyond human purposes is, in fact, a rebuke to all totalitarian schemes and all nihilist cynicism. It does so by inviting us to use our heads as best we can, to discern the evidences that bring us as close to Truth as human beings can attain. The notion of Truth is crucial to civilization. As Thomas Aquinas held, civilization is constituted by conversation. Civilized persons persuade one another through argument.
Barbarians club one another into submission.
Civilization requires citizens to recognize that they do not possess the Truth, but must be possessed by it, to the degree possible to them. Truth matters greatly. But Truth is greater than any one of us. Therefore, humans must learn such civilizing habits as being respectful and open to others, listening attentively, trying to see aspects of the Truth that they do not as yet see. Because the search for Truth is vital to each of us, humans must argue with each other, urge each other onward, point out deficiencies in one another's arguments, and open the way for greater participation in the Truth by every one of us.