For they have made ready their heart like an oven, While they lie in wait. Their baker sleeps all the night. In the morning it burns as a flaming fire.
We hence see that the similitude of an oven is set forth here by the Prophet in a sense different from what it had been before; and this ought to be noticed, because interpreters heedlessly pass over this wholly, as if the Prophet meant in both places the same thing. But the meaning, as it is evident, is far different. For he intended only, in the first instance, to reprove the mad lust with which they were burning; but he now speaks of their plots and concealed frauds; that is, that the Israelites before openly showed themselves to be ungodly and wicked, but that they were now wicked before God. How so? Because they were now like an oven lighted up in the night; for as the baker, having closed the door of his house, puts in fire, while none perceive that the furnace or the oven is being heated; so also the people fed and nourished their wickedness before God; and afterwards, in course of time, it broke forth openly, whenever an opportunity was offered. 