The rotal judgment in comment constitutes one of the first and, at the same time, more recent interpretations of the new text of can. 1678 § 1 in matter of “force of full proof” to be attributed to the declarations made by the parties. The sentence found itself having to resolve a very frequent problem in forensic practice, especially in cases where there is a strong opposition between the parties: that of establishing which of them should to be considered more credible. The sentence provides an interesting - but not entirely acceptable - interpretation of the new provision of can. 1678, § 1, affirming that it is possible to attribute, “vim plenae probationis” to the declaration of one of the parties, even if the same is contested and blatantly contradicted by the other.