Because each individual has their own languages (not equally-valid worldviews by the way, I think there is absolute truth), all incoming information to all people is slightly misinterpreted. Therefore, no one can ever, via outside information, completely understand anything communicated to them. How then can anyone be saved? How then can anyone understand the gospel?
This is why we, as humans, cannot save people in and of ourselves. God must speak our own language. He does that via the Holy Spirit.
