The birth of someone’s commitment to a common belief relies on the forms by which he adheres to what is common, not on the meaning of that belief as if it would be a cognitive statement.
The obstacles met in identifying the sources of a particular common belief are due to the fact that they are not to be found in the area of cognition.
The knowledge of manners and causes in the virtue of which someone is prone to embrace what is common should precede the analysis of the common beliefs themselves.
For instance, the common belief that the things of the world are really existent is accepted by someone who firstly needs to share with others the easiness of being together in a stable order. Afterward, such order is called as one belonging to things. Nobody questions his adherence to such common belief. If the existence of things would be a matter of doubts, an individual were be forced to search for the reality of his place in the world and will dismiss the problem of being together with others. Accordingly, a philosophical account of things that is based on the unquestioned admission of their reality will be marked by the desire of fitting its statements to the common expectations of other men.