Exactly what I said. You have lost track of the subject and your original statement, and made it your own subject, not that of the OP.
I never said he did or even hinted at such a thing, In fact I said he did teach them about it---but that is not what he was doing in the scripture you quote to show that when we present what the gospel to a non-believer, we have to preach at that time, the Doctrines of Grace. WHich is the claim you made. Perhaps you don't know that the DoG are the doctrines in TULIP and you only meant we preach that salvation is by grace and not works. I agree with that as an necessary part of preaching the gospel. If that is all you meant, just say so, and we can move on. I assumed when you said the DoG must be preached as part of the gospel, that that is what you meant.
The DoG has three other doctrines that precede and of necessity lead into irresistible (effectual) grace. Salvation is by grace even apart from Total Depravity. Unconditional Election, and Limited Atonement. The fact that you are breathing or had food for breakfast is by the grace of God. It is grace because God owes no one anything and they can do nothing to merit anything from him, certainly not forgiveness of sin and eternal life. All of that is Christian doctrine.
The gospel on the other hand is who Jesus is, what he did, and why he did it, and how his work is applied to a person (by grace and through faith).
