A belief is simply an assertion about a fact or law that we accept. It is something that we affirm, or at least acquiesce in, even though it is a matter of which we have no sure knowledge or proof. But it is something of which we are sufficiently confident to act upon. It is something we now accept as true.

Ruggero J. Aldisert, Agatha D. Aldisert, Logic for Lawyers- A Guide …, loc. 239