I happen to believe that God intends to fulfill the promises both in the OT & NT. I don’t think that makes me foolish.
As do I.
I dont think that makes me foolish.
What is foolish is reading one set of promises in isolation from the rest of the promises, and the explanation of the real meaning of those promises.
Some folks, for example, read Genesis 17 as if the New Testament didnt exist or was irrelevant. That was not the approach of the apostles who interpreted the promises in the new covenant context, once for all time.
Reading the Bible dispensationally is foolishness.
"Henceforth there is laid up for me a crown of righteousness, which the Lord, the righteous judge, shall give me at that day: and not to me only, but unto all them also that love his appearing." -- 2 Timothy 4:8
OT saints were saved by the same grace as NT saints. It's all about Christ. Period. Now. Then. Tomorrow. Forever.
"There is neither Jew nor Greek...for ye are all one in Christ Jesus." - Gal. 3:28