You would think, but I've found that after being here almost a decade and a half that there is always something new to discuss on a subject. Sure some things are redundant and some need to be explained to newbies coming in but when you are studying the bible I find that there is always something new to learn and we each have our own times to learn it.
2. Not an oxymoron, at all, He was (in a similar way to Shakespeare) inventing or creating hybrid terms to explain that observing Torah without the faith and relationship with God behind it cannot justify a person. He did not say the Torah itself was bad, but doing it like a teenager who hates doing the dishes or laundry for his parents isn't going to get you anywhere.
Funny you should compare Paul to Shakespeare but I understand what you are saying, however when the Torah was given the biggest part of the instructions were that you were to love G-d, not have faith in Him. Now faith in Him can be part of love, but it shouldn't usurp it. You keep his commandments because you love him. But Paul didn't teach that, wonder why?
Gal 5:14 For the whole Law is fulfilled in one word, in the statement, "YOU SHALL LOVE YOUR NEIGHBOR AS YOURSELF."
Romans 13:8 Owe nothing to anyone except to love one another; for he who loves his neighbor has fulfilled the law. 9 For this, "YOU SHALL NOT COMMIT ADULTERY, YOU SHALL NOT MURDER, YOU SHALL NOT STEAL, YOU SHALL NOT COVET," and if there is any other commandment, it is summed up in this saying, "YOU SHALL LOVE YOUR NEIGHBOR AS YOURSELF." 10 Love does no wrong to a neighbor; therefore love is the fulfillment of the law.
1John taught :
Whoever claims to love God yet hates a brother or sister is a liar.
and
We know we love God's children if we love God and obey his commandments.
and
By this we know that we love the children of God, when we love God and observe His commandments. 3For this is the love of God, that we keep His commandments; and His commandments are not burdensome.
Which of those two writers meshes with what Messiah taught?
Then one of them,
which was a lawyer, asked
him a question, tempting him, and saying, 36 Master, which
is the great commandment in the law? 37 Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind. 38 This is the first and great commandment. 39 And the second
is like unto it, Thou shalt love thy neighbour as thyself. 40 On these two commandments hang all the law and the prophets.
3. So in Acts 21:26 when it says he purified himself along with them, you don't take that to mean he took the vow also?
No, at first glance and a brief reading it sounds like it, but if you go through all the preceding chapters, it seems unlikely.