There is no conclusive and universally valid answer to the question whether reason is an accidental result of mindless evolution, or whether the world is the creation of reason while human intellect is its essence derives from the Divine Creative Reason. Every thinking person should choose the proper concept. Such a choice entails serious consequences since it decisively affects the interpretation of human facts and generates an overall attitude towards reality. The article presents some consequences concerning both choices and particularly focuses on the characteristics of the life environment seen from the perspective of a rational and believing person. The author presents his understanding of faith, based on the texts by Martin Buber, Josef Pieper, Józef Tischner and Stanisław Wszołek, and models the optimal form of the relationship between faith and reason. He elaborates on the idea that a Christian’s faith is Man’s response to being chosen by God. Everything essential in faith begins with interpersonal experiences. A person who lives in the environment of faith, hope and love will more easily discover that God is close to him. As a result, he will become a credible witness to the Gospel truth in his society.