Jesus begins his ministry with the same command for faith. The fundamental condition of the Christian life is faith, for with faith come hope and love and every good work and every good gift and power of the Holy Spirit. This is the doctrine of Christ, the apostles, and the Church. The second is faith in the sense of trust or reliance. For Christians both types of faith are necessary.
Faith is sometimes opposed to reason , and belief to knowledge .
According to Orthodoxy, faith and reason, belief and knowledge, are indeed two different things. They are two different things, however, which always belong together and which may never be opposed to each other or separated from each other. In the first place one cannot believe anything which he does not already somehow know. A person cannot possibly believe in something he knows nothing about. Secondly, what one believes in and trusts must be reasonable.