Truth

When two or more individuals agree upon the interpretation and experience of a particular event, a consensus about an event and its experience begins to be formed. This being common to a few individuals or a larger group, then becomes the 'truth' as seen and agreed upon by a certain set of people. Thus one particular group may have a certain set of agreed truths, while another group might have still different set of truths that have reached consensus.
When someone sincerely agrees with an assertion, they are claiming that it is the truth. Epistemology, the study of knowledge, seeks solutions for the many philosophical problems associated with truth.