The purpose of this book is to encourage, constitute the difference between faith and reason and also shows how God is powerful. How His name encompasses all forms of definition. Many say his name is Yahweh, for others, Elohim, the Lion of the tribe of Judah, El Shaddai, I am who I am..... His power remains unfailing, never ceases to perform his miracles. His promises and his covenant are eternal. Rationally, faith and reason are matters properly based on religions. Among the two who have the right to command the other. It is a question of specifying whether one can believe in order to know. Whether it is logical or legitimate to believe before knowing. Faith is an act of will, of listening, of understanding and of obedience. Faith is an intimate conviction, before the mystery of God it is faith. Reason was then powerless to think of the mystery of God. This explains also our philosophical and intellectual wisdom which is based on reason and human tradition. Often through our analysis we have been led to believe that God is limited. It is the rationality that speaks that immerses and makes us believe in heresy and a spiritual disorder contrary to holy doctrine. Author has been careful to explain throughout this book the different appreciations when you keep faith in your prayers.