Reason, Revelation and Symbol
Reason is not the source of theology, yet it plays a significant role in the theology. Tillich distinguishes two categories of reason, namely, an ontological reason and a technical reason. The former is the "structure of the mind which enables the mind to grasp and to shape reality," and the latter "is reduced to the capacity for ‘reasoning’" (71-75). For Tillich, the fundamental idea of reason is the ontological reason. The technical reason is adequate only as an adopted instrument for revealing the ontological reason. The ontological reason, in which subjective and objective are rooted, can be related to logos. The subjective reason can be defined as the rational structure of the mind, and that is able to catch and to form the reality. Relatively, the objective reason can be defined as the rational structure of reality, and that is caught and formed by the mind. Consequently, Logos is "the word which grasps and shapes reality" (74), and therefore is the ontological reason. Tillich takes the term, the depth of reason, to relate the transcendental power of which to the meaning of being-itself. However, reason subjects to our actual existence, and therefore reason experiences the limitations, conflicts, and ambiguities of our existence. Accordingly, a quest for revelation is inevitable to resolve the finitude of our reason.
Revelation unveils what concerns us ultimately. Tillich distinguishes two categories of revelation, namely, original and dependent revelation. An original revelation is a "giving" side revelation which never "gives" to us before, while the dependent revelation is a "receiving" side revelation by which the individual and the group are transformed. "Jesus is the Christ both because he could become the Christ and because he was received as the Christ" (126). Thus, the revelation of Jesus as the Christ, in which Christian message is rooted, is the final and actual revelation, and which in turn resolve the finitude of our existential reason. Revelation unveils our ultimate concern. Yet, the ground of revelation, for Tillich, is described as the "ground of being manifest in existence" (155). In terms of Christianity, "the ground of being is God" (156). Revelation mediates knowledge through human cognitive reason. The knowledge of revelation is the knowledge of God which must be described symbolically. The "Word of God" is a symbol for God revealing itself in Jesus as the Christ, because the Word of God reveals God’s manifestation in Jesus as the Christ which is the meaning of the symbol. For Tillich, symbols direct above themselves to something else. Symbols, not like signs, participate in the power of that which they symbolize. "A symbol has truth: it is adequate to the revelation it expresses. A symbol is true: it is the expression of a true revelation" (240). Religious symbols can be true symbols only if they participate in the power of the divine to which they point. Religious symbols are "double-edged," they point themselves to the infinite as well as the finite; they drive the infinite toward the finite and the finite toward the infinite; they unveil the divine life for the human and the human for the divine. Religious symbols transfer ultimate truth through things, persons and events.
More here
http://people.bu.edu/wwildman/WeirdWildWeb...755_tillich.htm