And now there is another reason we must extend this teaching a bit further. It is, as I have already said, that, seeing that men are created in the image of God and that their souls have been redeemed by the blood of Jesus Christ, we must try in every way available to us to draw them to the knowledge of the gospel. First, we try to reach them through gentleness and kindness. But have we determined whether men can be brought into obedience unto God in this way? Since we see that there is such hardness and rebellion in them that they cannot be won in this way, it is no longer a matter of using gentle tactics. Rather, we must storm out against them, as the Holy Spirit shows us here. And because of that, we understand why many people think they would like for us to refrain from all harshness when we speak of the pope and his ilk, calling him an antichrist, a murderer, a robber who kills poor souls, a thief who pillages God’s honour.John Calvin, Sermons on Acts 1-7, Sermon 41, Acts 7:51, p., 593.
For the faithless have no profit at all by the death and passion of our Lord Jesus Christ, but rather are so much the more damnable, because they reject the means that God had ordained: and their unthankfulness shall be so much the more grievously punished, because they have trodden under foot the blood of our Lord Jesus Christ, which was the ransom for their souls.
John Calvin, Sermons on Galatians, Sermon 2, 1:3-5, p., 39/27
It follows, moreover, that the poor souls whom our Lord Jesus Christ has bought so dearly that he did not spare himself to save them, perish and are given into Satan’s possession.
John Calvin, Sermons on Ephesians, 5:11-14, p., 525.
There’s a whole bunch more over here at David’s Calvin and Calvinism blog. That entire blog is loaded with great resources.
Even if you say Calvin’s just speaking pastorally, I have to ask, do you speak this way?