The call of the Holy Spirit.
Actually, there is both a spiritual lineage and an ordination lineage that should be recognized.
In my opinion, a member of the PCA can trace his faith through his doctrines back to the earliest Christian teachings.
Also, a member of the PCA can trace his faith through faithful men back to the earliest Christian teachings. Their history goes back to the Reformation, through those transitional figures to the same historic church that Roman Catholics accept, to the early fathers, and from those fathers to the early church.
Sorry guy. You could be mistaking that call for indigestion.
Any manjack carrying a bible can make a claim to divine inspiration and many do, funny how Christendom fell into disarray with the advent of the printing press: the devil sifts them like wheat, pride makes them disobedient and rebellious, and we get Mormons and 40,000 denominations of "Christian" and Muslims. No thanks.