Why is the ontological argument considered an a priori argument?
Correspondingly, what kind of argument is the ontological argument?
Ontological argument. An ontological argument is a philosophical argument for the existence of God that uses ontology. Many arguments fall under the category of the ontological, and they tend to involve arguments about the state of being or existing.
Likewise, is the cosmological argument a priori or a posteriori?
Recall that one of the noticeable features of the Ontological Argument is that it is a deductive argument that claims to be a priori--i.e., it claims that its premises can be known independent of experience, with only logic and language alone. In contrast, the Cosmological Argument is an a posteriori argument.
The argument entails that any conclusive ontological arguments would contradict the very nature of God. In short, it leads to the conclusion that no ontological argument can be successful. It should be noted that the above argument has the general form of a reductio ad absurdum.