Was Paul as the author of Hebrews and why did he not sign the book? 542 - 3 - 2

Paul wrote Hebrews to the believing Jews. Unfortunately, civil unrest seemed to follow Paul whenever and wherever he had to deal with his fellow Jews. The Judaizes did their best to undermine him. Perhaps Paul thought that if he signed the Book of Hebrews it would prejudice the Jews from even reading it. Now to the more interesting question, "Did Paul write the Book of Hebrews?" 

As an aside, although Martin Luther is given credit for the Reformation there were groups such as the Waldensians who centuries earlier adhered to the Gospel and the atoning death and justifying righteousness of Christ. Later Martin Luther had his epiphany when he read Habakkuk 2:4, "Behold, his soul which is lifted up is not upright in him: but the just shall live by his faith."

We know that Paul wrote both Romans and Galatians, two legs of a three legged stool “The just shall live by his faith." Romans dealt with “The just” and Galatians with “shall live.” “By faith” is the third leg necessary to keep the stool upright. A very reasonable conclusion would be that Paul also wrote Hebrews.

Romans 1:17, For therein is the righteousness of God revealed from faith to faith: as it is written, The just shall live by faith."

Galatians 3:11, "But that no man is justified by the law in the sight of God, it is evident: for, The just shall live by faith."

Hebrews 10:38, "Now the just shall live by faith: but if any man draw back, my soul shall have no pleasure in him."

In the Book of Galatians Paul repeatedly was confronted with the damage done by the Judaizes who were attempting to bring people back under the law including circumcision. Paul wrote Galatians 5:1, "Stand fast therefore in the liberty wherewith Christ hath made us free, and be not entangled again with the yoke of bondage."

Paul spent an inordinate amount of time in prison often writing his epistles while so confined. Hebrews 10:34, “For ye had compassion of me in my bonds, and took joyfully the spoiling of your goods, knowing in yourselves that ye have in heaven a better and an enduring substance.” While waiting to be executed, Paul wrote about persevering to the end, as is found in the book of Hebrews. 2 Timothy 4:7 “I have fought a good fight, I have finished my course, I have kept the faith:”

Paul included the word grace in the close of his epistles. Hebrews ends with “Grace be with you all. Amen.”

I have done my best to support my three-legged stool with (one) the trifecta of books concerning the just shall live by faith, (two) that Paul often wrote from prison and (three) Paul’s unique use of the word grace in closing his epistles. Also, the very fact that the book was unsigned is a good indicator that it was written by Paul. Otherwise, why wouldn't the author sign it?

From a book for an Issachar course I learned a phrase IMO applicable the Paul; ad hominem. From the book "Discerning Truth” by Jason Lisle:

"Ad Hominem:" 

The phrase ad hominem is Latin and means “to the man.” The fallacy is so named because it directs an argument against the person making a claim rather than the claim itself. The critic hopes that people will reject his opponent’s claim simply on the basis that there is something objectionable about the person making the claim." Unfortunately this was used by the liberals to great advantage in the US election of 2012.