St. Ambrose on Faith and Works

St. Ambrose of Milan ca. 338-397
The beauty of a good thing pleases the more, if it be shown under various aspects. For those are good things, whereof the texture of the priestly robe was the token, that is to say, either the Law, or the Church, which latter has made two garments for her spouse, as it is written — the one of action, the other of spirit, weaving together the threads of faith and works.
Whether, then, you join to faith already present in the soul, bodily acts agreeing thereto; or acts come first, and faith be joined as their companion, presenting them to God— here is the robe of the minister of religion, here the priestly vestment. Faith is profitable, therefore, when her brow is bright with a fair crown of good works. (Jam. 2:14-26) (De Fide 2:11,13-14)