Section — Wouters, Manual of Moral Theology
Section II. On Jurors
I. Jurors are called citizens constituted for giving judgment concerning the guilt of some accused person, especially concerning a more serious crime. When this judgment has been given by the jurors, ordinarily judges properly so called (that is, if the jurors have declared someone culpable) determine the penalty according to law. They are called jurors from the oath which they must swear concerning faithfully carrying out their office.
II. The institution of jurors, though not to be condemned in itself, is nevertheless less recommended; both because they are not bound to bring forward the reason for the judgment given by them, and because generally they are more easily moved than constituted judges by political passions, gifts, etc.
III. Many of the things which have been said concerning judges apply to jurors. I observe especially: Jurors are bound to give judgment according to inward persuasion. Thus the law establishes in regions in which jurors are used. Therefore they are bound to absolve the accused of whose crime and guilt they are not inwardly convinced, even if according to the things alleged and proved the accused appears guilty. It is disputed, note, whether they can declare guilty one whom by private judgment they hold as guilty, but who was not convicted in court. Some deny it, because the law which orders them to judge according to inward persuasion certainly understands this of inward persuasion drawn from the things brought forward and proved. Others affirm it, because such a law in its obvious sense understands inward conviction obtained in any way whatever.
1 Cf. Groeken, Lijkverbranding.