Evidentialism

Evidentialism is a theory of knowledge or epistemology that deals with epistemic justification. According to traditional epistemology a true belief is justified, or becomes a Justified True Belief when the evidence demonstrates it. In other words a true belief in something is not enough, there must be warrant or justification for it. A more promising view would be that, if one has evidence for a proposition, p, and nothing in his total evidence defeats his evidence for p, then p is justified for him.

Sources of Evidences
Sources of evidences are what collect and present data or evidence for a belief in a particular proposition.

Perception
The perception of a human being is based on physical sensation about the surrounding objects within the environment.

Memory
The process of recall about what has been learned through associative mechanisms

Introspection
The process of looking inward at thoughts in the mind.