English to Spanish Art/Literary Religion ancient book about Christian doctrine

The covenant of works was not built upon a very firm basis; and therefore must needs leave men full of fears and doubts. The covenant of works rested upon the strength of man's inherent righteousness; which though in innocence was perfect, yet was subject to change. Adam was created holy, but mutable; having a power to stand and a power to fall. He had a stock of original righteousness to begin the world with, but he was not sure he would not ***break***. He was his own pilot, and could steer right in the time of innocence; but he was not so secured but that he might dash against the rock of temptation, and he and his posterity be shipwrecked; so that the covenant of works must needs leave jealousies and doubtings in Adam's heart, as he had no security given him that he should not fall from that glorious state.