Human thought contains a great number of concepts and issues related to various topics, and to make use of which, scholars and researchers have paid too much attention to classifying them into groups of sciences according to their subject matter and the way of studying them, trying to discover the hierarchy between these sciences due to the order of their subjects; to get at a coherently cognitive system, including what is former and what is later according to reality and possibility, or according to learning and evidence. No doubt that among those concepts and matters, there is what is related to man’s perceptions and visions about the cause of the world and its characteristics and actions, which has been classified as world view or faith. In these pages, we want to show the conception of faith and its position in this human cognitive system, and its rank among all sciences in that system.