“Augustine observes how those who are addressed here as ‘being evil,’ are the very same into whose mouths but just now the Lord has put that word, ‘Our Father;’ to whom he has made the promise ‘Ask and it shall be given you;’ so that every faithful, i. e., believing man, has a double aspect, he is ‘evil’ through his old nature, he is good through participation with him who is the highest good, who is in some sense the alone good (Matth. xix. 17), the good in himself, and altogether good, while others are good through him, and only as they are sharers of his life.[”]
Source: wiktionary