In the Philosophy of Religion, an a posteriori argument for God's existence rooted in certain religious phenomena. There are two general types of arguments from religious experience:
The first is a consensus gentium argument derived from Anthropology. It holds that because religion is a ubiquitous human institution, even among cultures with no known history of interaction, the social phenomena of religion indicates the existence of some objective reality these various cultural activities all aim at. That is, because religion exists everywhere, the object of religion (i.e., God), must also exist.
The Argument from Mysticism holds that there are certain direct divine-human encounters which are by their very nature ineffable (i.e., indescribable), and that any person having such an experience has sufficient evidence for God's existence.