"For I would not, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits, that blindness in part is happened to Israel until the fullness of the Gentiles be come in." Romans 11:25.
The origin of both the mystery vine and the branches can be traced back to Genesis two where three different major vines can be identified.
You may wonder why some people like Abraham enjoyed great abundance and others do not. The difference lies in their ability to uncover the mystery vine and is connected.
It possible for one to transit from one vine to the others as Adam and Eve did. While it is possible for one to transit from one vine to the other, the consequences are grievous if one transit to the wrong one as we saw in the lives of Adam and Eve in the Bible.
Another grievous thing to do is to be ignorant of this important mystery vine or to feign ignorance as some Israelites have done and verdict of not enjoying from the mystery vine passed on them until the fullness of the Gentiles.
This mystery indeed is the missing grail that many ancients have desired to see.