Quotations and their weight

I've quoted several sources so far while looking at this subject, some of them Protestant, some of them Roman Catholic. But quoting a source does make it correct, it is merely a support to an argument. Just because I quote from a certain writer does not mean that I necessarilly agree with all that he or she has written.

For example, in the last post I quoted from the book Canon des Ecriture (for which I still have to discover the author) but there are other places in the pages I have read from this book where his arguments are based more on assumption than proof. He makes statements as if they were proven when in fact they are only his opinion or that of others, often regarding things where there is an evident lack of proof.

And I got to wondering, the fact that a certain book is quoted, does this necessarilly give any weight to the authority of the book, the correctness of the book, the truthfulness of the book, etc.

And can we ask this question regarding Jesus and his quotation of the Old Testament?

Often when Jesus quotes the Old Testament, or when the disciples quote it after he has returned to Heaven, it is to demonstrate that Jesus is the Messiah, it is to demonstrate that what God said to the Jewish people in the past has finally come true in the person of Jesus, it is to reveal that what God said in the past was so that the Jews might recognise the Messiah, Jesus, when he arrived.

Obviously I'll need to check the references, but it seems to me that Jesus and the disciples quote the Old Testament, in order to clarify who he his, what God expects of the people of Israel, what he has asked of them, etc.

Granted, if Jesus accepted these books as true and as the word of God, so should we, so when he quotes Scripture, it does give additional weight to Scripture. But I just wanted to point out that it was not the reason that he quoted it.

In the Old Testament as in the New Testament, there is no discussion of which books should be understood as being received from God. The absence of any argument seems to imply that everyone accepted the same books as Scripture.