Ammi:
Furthermore, the matter which is trying to be discerned, through a testimony, often has to do with the internal intentions and knowledge of a person. Thus making those judgments always an assumption.
A marriage nullity case usually examines a person’s act of marital consent and so, indeed, it is an attempt to discern a person’s “internal intentions” (or ability to formulate a binding, marital intention).
Evidence which illuminates a person’s intentions can be acquired (sometimes, of course, it doesn’t exist) and such evidence will always, eventually, find its source in the person him/herself: the person will say and/or do things which reveal the intention. Thus, a third party can offer pertinent and probative testimony. A judge, with such evidence in hand, can come to a definitive conclusion.
An assumption, on the other hand, is a conclusion not based on evidence.
Dan