Ambrose of Milan

That is truly the devil’s language, which seeks to cast down the soul of man from the high ground of its good deeds, while he shews at the same time both his weakness and malice, for he can injure no one that does not first cast himself down. For he who forsaking heavenly things pursues earthly, rushes as it were wilfully down the self-sought precipice of a falling life. As soon then as the devil perceived his dart blunted, he who had subdued all men to his own power, began to think he had to deal with more than man. But Satan transforms himself into an angel of light, and often from the Holy Scriptures weaves his mesh for the faithful: hence it follows, It is written, He shall give, &c.