<diacritize> Biandrata and David set about their task with vigor , producing the book De falsa et vera unius Dei Patris , Filii , et Spiritus Sancti cognitione The False and True Knowledge of the Unity of God the Father , Son , and Holy Spirit . <yor>Biandrata and Dávid set about their task with vigor , producing the book De falsa et vera unius Dei Patris , Filii , et Spiritus Sancti cognitione The False and True Knowledge of the Unity of God the Father , Son , and Holy Spirit . 