Incarnation, and Grace. Others can be known by natural reason also; for instance, the Unity of God, Creation, and the Spirituality of the Soul. The former, which are purely and simply matters of Faith, are revealed in order to be made known; whereas the latter are mentioned in Revelation to serve as a basis.
2. Another important distinction is that between matters of Faith and matters of morals. Matters of Faith refer to God and His works, and are primarily of a speculative character. Matters of morals refer to man and his conduct, for which they prescribe practical rules.
3. A third distinction is between truths revealed for their own sake and truths revealed for the sake of those. This distinction is of great importance with regard to the contents of Holy Writ.
4. Lastly, some truths stand out clearly in Revelation, and are revealed in their completeness, while others can only be inferred by means of reflection and study. The latter are called corollaries of the Faith, or theological truths. It may come to pass that these may be proposed as matter of Faith by the Church, because they are necessary for the support of the Faith and also for the attainment of its object.
These four groups of revealed truths may not inaptly be compared to the different parts of a tree. Matters of Faith, pure and simple, are like the trunk; the natural truths which serve as a basis are the roots; truths incidentally revealed are the bark which envelops and protects the trunk; truths inferred by ratiocination are the branches which spring from the trunk; while the practical truths are the buds and flowers, from which proceeds the fruit of Christian life.
II. Although, strictly speaking, things revealed are alone the subject-matter of Faith, nevertheless many truths belonging to the domain of natural reason, but at the same time so connected and interwoven with Revelation that they cannot be separated from it, may also be reckoned as matter of Faith. These truths are, as it were, the atmosphere in which the tree of Revelation lives and thrives. The determination of the meaning of words used for the
