But “Bible-trained” instead of systematically trained preachers frequently preach error. They may mean ever so well and be ever so true to the gospel on certain points; nevertheless, they often preach error. There are many “orthodox” preachers today whos study of Scripture has been so limited to what it says about soteriology that they could not protect the fold of God against heresies on the person of Christ. Oftentimes they themselves even entertain definitely heretical notions on the person of Christ, though perfectly unaware of the fact.

Cornelius Van Til, An Introduction to Systematic Theology, 5.