is known through reason, rationality (natural revelation) and faith (supernatural revelation). Supernatural revelation has its origin in the inspiration of the Holy Spirit and is made available through the teaching of the prophets, summed up in Holy Scripture, and transmitted by the Magisterium, the sum of which is called "Tradition". Natural revelation is the truth available to all people through their human nature and powers of reason. For example, he felt this applied to rational ways to know the existence of God. Though one may deduce the existence of God and his Attributes (Unity, Truth, Goodness, Power, Knowledge) through reason, certain specifics may be known only through the special revelation of God through Jesus Christ. The major theological components of Christianity, such as the Trinity, the Incarnation, and charity are revealed in the teachings of the church and the scriptures and may not otherwise be deduced. However, Aquinas also makes a distinction between "demonstrations" of sacred doctrines and the "persuasiveness" of those doctrines. The former is akin to something like "certainty", whereas the latter is more probabilistic in nature. In other words, Aquinas thinks Christian doctrines are "fitting" to reason (i.e. reasonable), even though they can't be demonstrated beyond a reasonable doubt. In fact, the Summa Theologica is filled with examples of Aquinas arguing that we would expect certain Christian doctrines to be true, even though these expectations aren't demonstrative (i.e. 'fitting' or reasonable). For example, Aquinas, argues that we would expect God to become incarnate, and we would expect a resurrected Christ to not stay on Earth. Preserving nature within grace Revealed knowledge does not negate the truth and the completeness of human science as human, it further establishes them. First, it grants that the same things can be treated from two different perspectives without one canceling the other; thus there can be two sciences of God. Second, it provides the basis for the two sciences: one functions through the power of the light of natural reason, the other through the light of divine revelation. Moreover, they can, at least to some extent, keep out of each other's way because they differ "according to genus". Sacred doctrine is a fundamentally different kind of thing from theology, which is part of philosophy (ST I. 1.1 ad 2). Faith and reason complement rather than contradict each other, each giving different views of the same truth. God Augustine of Hippo's reflexion on