We’re tempted in various ways, not only to do things God said not to do, but to think things about God that aren’t true.
C.S. Lewis talked about this in A Grief Observed, that, after his wife died, he didn’t doubt that there was a God. He didn’t doubt that God was sovereign. He doubted whether or not God was good.
“Not that I am (I think) in much danger of ceasing to believe in God. The real danger is of coming to believe such dreadful things about Him.”
This is the serpent’s work. What did he get Eve to believe? That God was not good. God was holding something back from Adam and Eve. God was trying to keep them away from having something tasty—the fruit that delighted the eyes, and even from having something better than human—they could be like God.
This adds some background to the most repeated lyric in the Psalms:
For He is good,
His steadfast love endures forever.
You’re a Calvinist? Good, but take care. Your certainty of God’s power and control sets you up to question God’s person and character. Hear His Word, remember as much as you can the things He should be thanked for, and know that it is God’s goodness at work when He cuts off Your pride and self-pity and any pursuit of soul poisons.