The subject of Doubt, Certain, Truth and Faith, based on the research topics conducted by Fernand D'Amico and Jacques Wisman, is proposed in this book as a themed walk through the passages of Scripture from the Old and New Testament. The biblical text (KJV) is presented deliberately devoid of additional comments to offer an immediate and direct perception of the selected track. The thematic reading of the biblical text opens to the reader as a fascinating experience that allows him to benefit in a short time, a surprising and rich picture of content. Doubt it stimulates the search for certainty, this is reached in stages after the truth. The truth becomes more valuable because of the faith that stabilizes the contents in the subjective dimension of knowledge and prepare to operate in conformity with the truth of that which is believed. Here lies the secret of energy that moves all things. Find it, means to have a great and wonderful source of knowledge.