God is rational, and the universe is governed by unchanging natural laws instituted by Him. The Bible tells us in the Book of Genesis that “God created the heavens and the earth.” God is not arbitrary; the Bible also tells us that He is just and that He keeps promises to His people. The prophet Jeremiah tells us that God has established “ordinances of heaven and earth.” Since they come from a perfect lawgiver, we know that these laws do not change on a whim.
These beliefs were radical, and given historical trends in philosophy, they remain so. Pagans argued that truth exists, but that it is dependent on the will of the gods. Since these gods were capricious rulers of the universe, there were no unchanging laws that could be discovered by humans. In our own day, postmodern constructivist philosophers like Giambattista Vico also argue that objective truth is unknowable. For them, this is because truth is only accessible to humans insofar as we agree with something we have manufactured and labeled as the truth. As Vico put it, “the norm of the truth is to have made it.” If pure naturalism is correct and there is no role for God, then Vico can reasonably argue “the mind does not make itself as it gets to know itself and since it does not make itself, it does not know the genus or mode by which it makes itself.” After all, our ability to understand things as they truly are is difficult to argue in the absence of any reason to think that human reason itself is reliable.
Christianity offers just that reason by asserting two main points: that God has made the universe according to natural laws and that He has given humanity the means to understand them. As God asks Job, “Who endowed the heart with wisdom or gave understanding to the mind? Who has the wisdom to count the clouds? Who can tip over the water jars of the heavens when the dust becomes hard and the clods of earth stick together?” God gives understanding to the mind so that we may know Who has made the world and the universe as it is.
God intends for us to exercise our reason and seek to know reality. Jesus says that He is the Truth, and He promises His followers that “the truth will set you free.” The truth that Jesus speaks of is not, of course, purely scientific and rationalistic. It is the truth of the universe and of humanity. Pope Benedict XVI reiterates this in Caritas in Veritate, where he writes, “Truth, by enabling men and women to let go of their subjective opinions and impressions, allows them to move beyond cultural and historical limitations and to come together in the assessment of the value and substance of things.”
Since truth is objective, reason can discern it. Reason is the universal nature of humans, regardless of our race, culture, language, class, or religion. We all have access to the truth. In a world where subjective truths compete, humanity can no longer find common ground and rise above struggles for power and influence. The truth about humanity and natural reality becomes “Nordic,” “bourgeois,” “imperialist,” or “chauvinist.” The idea that truth is subjective does not set us free. It pits us against each other and fails to let us seek the truth.
Caritas in Veritate points out the dire social consequences: “Without truth, without trust and love for what is true, there is no social conscience and responsibility, and social action ends up serving private interests and the logic of power, resulting in social fragmentation, especially in a globalized society at difficult times like the present.” If we are to seek true solidarity and the creation of a humane world, we must commit ourselves to pursuing the truth. Otherwise, humanity’s divisions will only grow.
By choosing instead to follow constructivism, fundamentalism, fideism, and the consensus view of the truth, we are enslaving ourselves to error and cutting off the truth that unites us. We are also rejecting the duty that God has given us to use the gift of reason to seek Him out. Since this sin only gives us error in place of the truth about us and the universe we inhabit, it results in suffering, tyranny, and conflict.
The truth will set us free in the measure that we are willing to seek it as God commands us to, and in the measure that we reject anything less than the full, universal, reasonable nature that it has.