Beware of Knox’s apparent heterodoxy
That 1958 Article appears virulently biased and over practically nothing. If one is going to “test” a translation by certain key passages then at least Knox uses “She is to crush thy head, while thou dost lie in wait at her heels.” for Gen 3:15. In Luke 1: 28 he translates “Hail, thou who art full of grace; the Lord is with thee; Blessed art thou among women.” Two very troublesome passages for modern Bibles, but as traditional as Challoner in Knox’s version.
The fuss that is made over Isaiah 7:14 being “heterodox” is ludicrous. The Latin will easily admit “maid” or “maiden.” Maybe the real problem today is that equating a young girl, or young maid, with a virgin is unrealistic. However, the idea was very realistic to Isaiah. A maid was a virgin, if she wasn’t a virgin, then she wasn’t a maid. So to say that a maid would be brought to bed of a son, is just as shocking as to say a virgin would be brought to bed of a son. The Latin “virgo” can be translated virgin, maid, or young girl. Nowadays we are very
clinical about what constitutes a virgin. We don’t see it as a great “sign” that a maid would conceive a son. But when that sign is given by GOD, and God is using the word maid (which is the context) then you can take it to the bank, that this maid is clinically a virgin.

Knox says in his notes that the word is more related to a time of life than a state of life. He eschewed “virgin” only because he felt that was putting too much emphasis on the state, and not enough on the time. In the event we know that the BVM was both very young, and a virgin, so the prophecy is fulfilled more with “maid” than “virgin” by today’s critical standards. Some might cavil that a virgin can also be very old, and so would also miss the mark of the prophecy. Clinically, however, it would impress our age more, and maybe that is why the article took so much umbrage.
Anyone that is familiar with Knox knows that his translation is dynamic, but hardly an egregious paraphrase like the Good News Bible. It is indeed easy reading for someone uncomfortable with older English, or overly literal translations.
Baronius Press is getting ready to reprint the Knox Bible, and they are notoriously conservative and orthodox. In reality the Knox Bible is far more orthodox than our own NAB, both in the notes and in the text.