Tillich claims Christians are concerned with truth and the ultimate reality of truth. Deep faith will not be threatened by the search for ultimate reality. Reasoning is essentially a human trait that can not be taken lightly. A philosopher searchers for experiences and symbols, and is in constant pursuit for ultimate reality. Reason blinds a humans faith in God.
Reason can create sin.
In conclusion, Tillich being a philosopher and a theologian, stands firm on the idea of God being next to humans, not an object. Religious knowledge is symbolic, and God therefore is in everything. God is the only perfect One . . . Through religion man can grasp faith, and be guaranteed eternal salvation. It is theology, and serving the needs of the church, that teaches the two basic functions of revelation.