If the young monk really “kept the Rule,” then his extravagant penances for the purpose of gaining a gracious God can have had no existence outside his brain; the Rule prohibited all exaggeration in fasting and maceration, wilful loss of sleep and senseless exposure to cold. The Augustinian Rule, devised expressly as it was, to be not too severe in view of the exacting labours involved by preaching and the care of souls, had been further mitigated on the side of its penitential exercises by Staupitz’s new constitutions in 1504.[676] It was true the prior might sanction something beyond what the Rule enjoined, but it is scarcely credible that a beginner like Luther should have been allowed to exceed to such an extent the limit of what was adapted to all. His bodily powers were already sufficiently taxed by his studies, the more so since he threw himself into them with such impetuous ardour. It is all the less likely that any such special permission was given him, seeing that, as we know, Staupitz had, in consideration of his studies, dispensed the young monk from the performance of the humbler duties of the monastery. If what has been said holds good of the years spent at Erfurt, much less can there be any question of his having indulged in excessive rigour during his Wittenberg period. Here Luther began at an early date to inveigh against what he thought was excessive strictness on the part of his brother monks, against their observance and against all so-called holiness-by-works. In his sermons and writings of that time we have an echo of his vexation at the too great stress laid on works;[677] but such a frame of mind, which was by no means of entirely new growth, surely betrays laxity rather than over-great zeal. The doctrine of the all-sufficiency of faith alone and of Christ’s Grace was already coming to the front.