Alexander Maclaren 
Expositions of Holy Scripture Ephesians; Epistles of St. Peter and St. John [EPUB ebook] 

We are accustomed to confine the word to persons who tower above their brethren in holiness and manifest godliness and devoutness. The New Testament never does anything like that. Some people fancy that nobody can be a saint unless he wears a special uniform of certain conventional sanctities. The New Testament does not take that point of view at all, but regards all true believers in Jesus Christ as being, therein and thereby, saints.