John Calvin Commentary Psalms 78:32

"For all this they sinned still, And believed not in his wondrous works." — Psalms 78:32 (ASV)

For all this they still sinned. It is a common proverb that fools become wise when the rod is applied to them. Therefore, it follows that those who have often been chastised by God, and yet are not by it brought to repentance and amendment, are to be utterly despaired of.

Such was the obstinacy of the Israelites described here. They could not be reformed by any of the afflictions that were sent upon them. It was a dreadful manifestation of God's vengeance to see so many bodies of strong and vigorous men stretched dead on the ground. It was therefore a proof of monstrous obduracy when they were not moved by such an appalling spectacle.

The expression wondrous works, does not only mean the plague just mentioned; the other miracles, previously mentioned, are also included. Therefore, the people are charged with a twofold wickedness: they are accused not only of disbelieving God's word, but also of despising the miracles that He performed. For this reason, it is added that their plagues were increased, just as God denounces and threatens through Moses that He will deal sevenfold more severely with the obstinate and hardened who persevere in their wickedness.