R.C. Sproul on the Necessity of Classical Apologetics
"[Formal certainty for the existence of God] can only be arrived at through a logical proof that is irrefutable. Classical Apologetics says that the case for the existence of God can be proven demonstrably, rationally, formally, and compellingly. So it's a little stronger than evidentialists [those who focus on observations from nature, history, and accounts of prophecies and miracles], who are more empirically-oriented. [Classical Apologetics] is the way apologetics ought to be done: you don't just say to the scientific community, 'Well, you're working on the wrong presuppositions,' or, 'You have the wrong worldview.' That's true, but you have to begin to show them that the conclusions they've drawn from their own evidence are formally invalid."