It is not for us to imagine that we can prove the truth of Christianity by our own arguments; nobody can prove the truth of Christianity except the Holy Spirit, by his own almighty work of renewing the blinded heart. It is the sovereign prerogative of Christ's Spirit to convince men's consciences of the truth of Christ's gospel; and Christ's human witnesses must learn to ground their hopes of success not on clever presentation of the truth by man, but on powerful demonstration of the truth by the Spirit.