“For I would not, brethren, 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 fulness of the Gentiles be come in.”
King James Version (KJV)
11:25 St. Paul calls any truth known but to a few, a mystery. Such had been the calling of the gentiles: such was now the conversion of the Jews. Lest ye should be wise in your own conceits - Puffed up with your present advantages; dreaming that ye are the only church; or that the church of Rome cannot fail. Hardness in part is happened to Israel, till - Israel therefore is neither totally nor finally rejected. The fullness of the gentiles be come in - Till there be a vast harvest amongst the heathens.
Ro 11:25 I would not, brethren, that ye should be ignorant of this mystery. Any secret thing, known to but a few, is called "a mystery". The mystery that Paul is about to unfold is concerning the conversion of Israel. He unfolds it lest the Gentile Christians should be wise in your own conceits, or may have incorrect views. The first thing noted in explaining this mystery, is that blindness in part hath happened to Israel. This blindness, or hardening, had been due to Israel's sins, especially to unbelief. The second fact is that it would continue until the fulness of the Gentiles shall be come in, or the greater part of the Gentile world been converted.