Why: such acts neither proceed from love of God nor are directed to his glory
Thesis XII. The reason why, on Protestant doctrine, the acts of a sinner done without the grace of Christ really have the character of sin, though they are good in their kind and as to the matter of the work, is that they neither proceed from the love of God nor are directed to his glory.
The Protestants hold that both of these are plainly necessary for any work that is truly good and good in God's judgement, and they consider that neither can be found in fallen man without the saving grace of Christ.
Latin
XII. Quod enim actiones hominis peccatoris sine Christi gratia factae, quamvis ex suo genere, & secundum operis materiam bonae sint, revera tamen, secundum Protestantium doctrinam, rationem peccati habeant, causa est, quia neque ex Dei amore procedunt, neque ad Dei gloriam diriguntur. Utrumque enim ad opus quodlibet vere bonum, & Dei judicio tale, plane necessarium putant: neutrum vero in homine Lapso sine gratia Christi salutifera locum habere posse existimant.