John Calvin on Hosea 4:1

Hosea now relates how vehemently he reproved the people, because every kind of corruption so commonly prevailed, that there was no sound part in the whole community. We hence see what the Prophet treats of now; and this ought to be observed, for hypocrites wish ever to be flattered; and when the mercy of God is offered to them, they seek to be freed from every fear. It is therefore a bitter thing to them, when threatening are mingled, when God sharply chides them. “What! we heard yesterday a discourse on God’s mercy, and now he fulminates against us. He is then changeable; if he were consistent, would not his manner of teaching be alike and the same today?” But men must be often awakened, for forgetfulness of God often creeps over them; they indulge themselves, and nothing is more difficult than to lead them to God; nay, when they have made some advances, they soon turn aside to some other course.

We hence see that men cannot be taught, except God reproves their sins by his word; and then, lest they despond, gives them a hope of mercy; and except he again returns to reproofs and threatening. This is the mode of address which we find in all the Prophets.

John Calvin, Hosea, electronic ed., Calvin’s Commentaries (Albany, OR: Ages Software, 1998).