Notice how you focused on "calling" versus "God hath chosen".
I guess your free-willer lenses blinded you from this lol.
And, v. 30 is plainly talking about salvation terms.
By the way, I understood predestination and election prior to salvation, simply from reading the Bible. I belonged to a free-willer cult at the time I became a believer, and was informed by the minister of the cult that God didn't know the future, and predestination was a false teaching.
Therefore, your claim breaks down. I learned about Reformed theology much later, and it made total sense given my own conversion experience. God simply regenerated me and this enabled faith and repentance. I know it's true
We are humble in the sense that we know that God caused our salvation, and we did not cause it ourselves. There is a tendency toward pride in ALL MEN, whether Reformed or not.
But, the cause of pride in Reformed people is not because we think we brought ourselves into salvation, because we know we did not. We know we did nothing to merit our salvation whatsoever.
And, we know that all is to the glory of God. That is why we strongly affirm Soli Deo Gloria, which is something you rarely hear from the lips of free-willers.