An interesting name of which I will have some trouble explaining. The fallacy involves a proposition that requires its own truth to be accepted, in one way or another, to prove itself.
Circularity is easier to explain.
These statement that requires itself to be true already before it is proven can be thought of like a circle. The speaker assumes the truth of a statement to be its own proof. Argument A Argument A requires Argument A 's truth to be assumed if it is to be proven Therefore, Argument A is true This argument is a fallacy because the statement itself is not proof of anything. Many elaborate ways or restating the point are available to the sly opponent to go about proving a proposition using only itself, so don't be fooled. The Bible says so.